diff --git a/src/main/java/baritone/bot/Settings.java b/src/main/java/baritone/bot/Settings.java
index d226763c..bb12fcba 100644
--- a/src/main/java/baritone/bot/Settings.java
+++ b/src/main/java/baritone/bot/Settings.java
@@ -51,7 +51,7 @@ public class Settings {
     ));
     public Setting<Boolean> renderGoal = new Setting<>(true);
     public Setting<Integer> pathingMaxChunkBorderFetch = new Setting<>(50);
-    public Setting<Double> backtrackCostFavoringCoefficient = new Setting<>(0.9);
+    public Setting<Double> backtrackCostFavoringCoefficient = new Setting<>(0.9);  // see issue #18
     public Setting<Float> pathRenderLineWidth = new Setting<>(5F);
     public Setting<Float> goalRenderLineWidth = new Setting<>(3F);
 
diff --git a/src/main/java/baritone/bot/pathing/calc/AStarPathFinder.java b/src/main/java/baritone/bot/pathing/calc/AStarPathFinder.java
index 9d308162..2fab0358 100644
--- a/src/main/java/baritone/bot/pathing/calc/AStarPathFinder.java
+++ b/src/main/java/baritone/bot/pathing/calc/AStarPathFinder.java
@@ -151,6 +151,7 @@ public class AStarPathFinder extends AbstractNodeCostSearch implements Helper {
                     throw new IllegalStateException(movementToGetToNeighbor.getClass() + " " + movementToGetToNeighbor + " calculated implausible cost " + actionCost);
                 }
                 if (favoring && favored.contains(dest)) {
+                    // see issue #18
                     actionCost *= favorCoeff;
                 }
                 PathNode neighbor = getNodeAtPosition(dest);
diff --git a/src/main/java/baritone/bot/pathing/movement/ActionCosts.java b/src/main/java/baritone/bot/pathing/movement/ActionCosts.java
index d21b9384..ee0eb907 100644
--- a/src/main/java/baritone/bot/pathing/movement/ActionCosts.java
+++ b/src/main/java/baritone/bot/pathing/movement/ActionCosts.java
@@ -24,7 +24,7 @@ public interface ActionCosts extends ActionCostsButOnlyTheOnesThatMakeMickeyDieI
      */
     double WALK_ONE_BLOCK_COST = 20 / 4.317; // 4.633
     double WALK_ONE_IN_WATER_COST = 20 / 2.2;
-    double JUMP_ONE_BLOCK_COST = 5.72854;//see below calculation for fall. 1.25 blocks
+    double WALK_ONE_OVER_SOUL_SAND_COST = WALK_ONE_IN_WATER_COST; // TODO issue #7
     double LADDER_UP_ONE_COST = 20 / 2.35;
     double LADDER_DOWN_ONE_COST = 20 / 3.0;
     double SNEAK_ONE_BLOCK_COST = 20 / 1.3;
diff --git a/src/main/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.java b/src/main/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.java
index 2241bf8c..e69dce85 100644
--- a/src/main/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.java
+++ b/src/main/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.java
@@ -20,6 +20,23 @@ package baritone.bot.pathing.movement;
 public interface ActionCostsButOnlyTheOnesThatMakeMickeyDieInside {
     double[] FALL_N_BLOCKS_COST = generateFallNBlocksCost();
 
+    double FALL_1_25_BLOCKS_COST = distanceToTicks(1.25);
+    double FALL_0_25_BLOCKS_COST = distanceToTicks(0.25);
+    /**
+     * When you hit space, you get enough upward velocity to go 1.25 blocks
+     * Then, you fall the remaining 0.25 to get on the surface, on block higher.
+     * Since parabolas are symmetric, the amount of time it takes to ascend up from 1 to 1.25
+     * will be the same amount of time that it takes to fall back down from 1.25 to 1.
+     * And the same applies to the overall shape, if it takes X ticks to fall back down 1.25 blocks,
+     * it will take X ticks to reach the peak of your 1.25 block leap.
+     * Therefore, the part of your jump from y=0 to y=1.25 takes distanceToTicks(1.25) ticks,
+     * and the sub-part from y=1 to y=1.25 takes distanceToTicks(0.25) ticks.
+     * Therefore, the other sub-part, from y=0 to y-1, takes distanceToTicks(1.25)-distanceToTicks(0.25) ticks.
+     * That's why JUMP_ONE_BLOCK_COST = FALL_1_25_BLOCKS_COST - FALL_0_25_BLOCKS_COST
+     */
+    double JUMP_ONE_BLOCK_COST = FALL_1_25_BLOCKS_COST - FALL_0_25_BLOCKS_COST;
+
+
     static double[] generateFallNBlocksCost() {
         double[] costs = new double[257];
         for (int i = 0; i < 257; i++) {
diff --git a/src/main/java/baritone/bot/pathing/movement/MovementHelper.java b/src/main/java/baritone/bot/pathing/movement/MovementHelper.java
index 39fedd1a..65a645ff 100644
--- a/src/main/java/baritone/bot/pathing/movement/MovementHelper.java
+++ b/src/main/java/baritone/bot/pathing/movement/MovementHelper.java
@@ -43,8 +43,8 @@ import java.util.Optional;
  */
 public interface MovementHelper extends ActionCosts, Helper {
 
-    static boolean avoidBreaking(BlockPos pos) {
-        Block b = BlockStateInterface.getBlock(pos);
+    static boolean avoidBreaking(BlockPos pos, IBlockState state) {
+        Block b = state.getBlock();
         BlockPos below = new BlockPos(pos.getX(), pos.getY() - 1, pos.getZ());
         return Blocks.ICE.equals(b) // ice becomes water, and water can mess up the path
                 || b instanceof BlockSilverfish
@@ -63,8 +63,7 @@ public interface MovementHelper extends ActionCosts, Helper {
      * @return
      */
     static boolean canWalkThrough(BlockPos pos) {
-        IBlockState state = BlockStateInterface.get(pos);
-        return canWalkThrough(pos, state);
+        return canWalkThrough(pos, BlockStateInterface.get(pos));
     }
 
     static boolean canWalkThrough(BlockPos pos, IBlockState state) {
@@ -126,21 +125,20 @@ public interface MovementHelper extends ActionCosts, Helper {
                 || block instanceof BlockCactus
                 || block instanceof BlockFire
                 || block instanceof BlockEndPortal
-                || block instanceof BlockWeb
-                || block instanceof BlockMagma;
+                || block instanceof BlockWeb;
     }
 
     /**
      * Can I walk on this block without anything weird happening like me falling
      * through? Includes water because we know that we automatically jump on
-     * lava
+     * water
      *
      * @return
      */
     static boolean canWalkOn(BlockPos pos, IBlockState state) {
 
         Block block = state.getBlock();
-        if (block instanceof BlockLadder || block instanceof BlockVine) {
+        if (block instanceof BlockLadder || block instanceof BlockVine) { // TODO reconsider this
             return true;
         }
         if (block instanceof BlockAir) {
@@ -149,15 +147,14 @@ public interface MovementHelper extends ActionCosts, Helper {
         if (BlockStateInterface.isWater(block)) {
             return BlockStateInterface.isWater(pos.up()); // You can only walk on water if there is water above it
         }
-        if (block.equals(Blocks.MAGMA)) {
+        if (Blocks.MAGMA.equals(block)) {
             return false;
         }
         return state.isBlockNormalCube() && !BlockStateInterface.isLava(block);
     }
 
     static boolean canWalkOn(BlockPos pos) {
-        IBlockState state = BlockStateInterface.get(pos);
-        return canWalkOn(pos, state);
+        return canWalkOn(pos, BlockStateInterface.get(pos));
     }
 
     static boolean canFall(BlockPos pos) {
@@ -166,12 +163,16 @@ public interface MovementHelper extends ActionCosts, Helper {
 
     static double getMiningDurationTicks(ToolSet ts, BlockPos position) {
         IBlockState state = BlockStateInterface.get(position);
+        return getMiningDurationTicks(ts, position, state);
+    }
+
+    static double getMiningDurationTicks(ToolSet ts, BlockPos position, IBlockState state) {
         Block block = state.getBlock();
-        if (!block.equals(Blocks.AIR) && !canWalkThrough(position)) {
+        if (!block.equals(Blocks.AIR) && !canWalkThrough(position, state)) {
             if (!Baritone.settings().allowBreak.get()) {
                 return COST_INF;
             }
-            if (avoidBreaking(position)) {
+            if (avoidBreaking(position, state)) {
                 return COST_INF;
             }
             double m = Blocks.CRAFTING_TABLE.equals(block) ? 10 : 1;
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementAscend.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementAscend.java
index 7a8d5176..51e9db3c 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementAscend.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementAscend.java
@@ -26,6 +26,7 @@ import baritone.bot.pathing.movement.MovementState.MovementStatus;
 import baritone.bot.utils.BlockStateInterface;
 import baritone.bot.utils.InputOverrideHandler;
 import baritone.bot.utils.Utils;
+import net.minecraft.block.Block;
 import net.minecraft.block.BlockFalling;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.client.Minecraft;
@@ -82,14 +83,29 @@ public class MovementAscend extends Movement {
             return COST_INF;
         }
         if (BlockStateInterface.get(src.up(3)).getBlock() instanceof BlockFalling) {//it would fall on us and possibly suffocate us
-            return COST_INF;
+            // HOWEVER, we assume that we're standing in the start position
+            // that means that src and src.up(1) are both air
+            // maybe they aren't now, but they will be by the time this starts
+            Block srcUp = BlockStateInterface.get(src.up(1)).getBlock();
+            Block srcUp2 = BlockStateInterface.get(src.up(2)).getBlock();
+            if (!(srcUp instanceof BlockFalling) || !(srcUp2 instanceof BlockFalling)) {
+                // if both of those are BlockFalling, that means that by standing on src
+                // (the presupposition of this Movement)
+                // we have necessarily already cleared the entire BlockFalling stack
+                // on top of our head
+
+                // but if either of them aren't BlockFalling, that means we're still in suffocation danger
+                // so don't do it
+                return COST_INF;
+            }
         }
-        double halfWalk = WALK_ONE_BLOCK_COST / 2;
+        // TODO maybe change behavior if src.down() is soul sand?
+        double walk = WALK_ONE_BLOCK_COST;
         if (toPlace.getBlock().equals(Blocks.SOUL_SAND)) {
-            halfWalk *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
+            walk *= WALK_ONE_OVER_SOUL_SAND_COST / WALK_ONE_BLOCK_COST;
         }
-        // we walk half the block to get to the edge, then we walk the other half while simultaneously jumping (math.max because of how it's in parallel)
-        return halfWalk + Math.max(JUMP_ONE_BLOCK_COST, halfWalk) + getTotalHardnessOfBlocksToBreak(context.getToolSet());
+        // we hit space immediately on entering this action
+        return Math.max(JUMP_ONE_BLOCK_COST, walk) + getTotalHardnessOfBlocksToBreak(context.getToolSet());
     }
 
     @Override
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementDescend.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementDescend.java
index 7be59858..202e9f6f 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementDescend.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementDescend.java
@@ -48,7 +48,8 @@ public class MovementDescend extends Movement {
         // we walk half the block plus 0.3 to get to the edge, then we walk the other 0.2 while simultaneously falling (math.max because of how it's in parallel)
         double walk = WALK_OFF_BLOCK_COST;
         if (BlockStateInterface.get(src.down()).getBlock().equals(Blocks.SOUL_SAND)) {
-            walk *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
+            // use this ratio to apply the soul sand speed penalty to our 0.8 block distance
+            walk *= WALK_ONE_OVER_SOUL_SAND_COST / WALK_ONE_BLOCK_COST;
         }
         return walk + Math.max(FALL_N_BLOCKS_COST[1], CENTER_AFTER_FALL_COST) + getTotalHardnessOfBlocksToBreak(context.getToolSet());
     }
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementDiagonal.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementDiagonal.java
index c7a045f2..c0d69b2e 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementDiagonal.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementDiagonal.java
@@ -78,11 +78,15 @@ public class MovementDiagonal extends Movement {
             return COST_INF;
         }
         double multiplier = WALK_ONE_BLOCK_COST;
+
+        // for either possible soul sand, that affects half of our walking
         if (destWalkOn.getBlock().equals(Blocks.SOUL_SAND)) {
-            multiplier *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
-        } else if (BlockStateInterface.get(src.down()).getBlock().equals(Blocks.SOUL_SAND)) {
-            multiplier *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
+            multiplier += (WALK_ONE_OVER_SOUL_SAND_COST - WALK_ONE_BLOCK_COST) / 2;
         }
+        if (BlockStateInterface.get(src.down()).getBlock().equals(Blocks.SOUL_SAND)) {
+            multiplier += (WALK_ONE_OVER_SOUL_SAND_COST - WALK_ONE_BLOCK_COST) / 2;
+        }
+
         if (BlockStateInterface.get(positionsToBreak[2].down()).getBlock() instanceof BlockMagma) {
             return COST_INF;
         }
@@ -110,12 +114,15 @@ public class MovementDiagonal extends Movement {
                 return COST_INF;
             }
         }
+        if (BlockStateInterface.isWater(src) || BlockStateInterface.isWater(dest)) {
+            // ignore previous multiplier
+            // whatever we were walking on (possibly soul sand) doesn't matter as we're actually floating on water
+            // not even touching the blocks below
+            multiplier = WALK_ONE_IN_WATER_COST;
+        }
         if (optionA != 0 || optionB != 0) {
             multiplier *= SQRT_2 - 0.001; // TODO tune
         }
-        if (BlockStateInterface.isWater(src) || BlockStateInterface.isWater(dest)) {
-            multiplier *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
-        }
         if (multiplier == WALK_ONE_BLOCK_COST && context.canSprint()) {
             // if we aren't edging around anything, and we aren't in water or soul sand
             // we can sprint =D
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementDownward.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementDownward.java
index 20aad6df..b8145e94 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementDownward.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementDownward.java
@@ -25,6 +25,7 @@ import baritone.bot.utils.BlockStateInterface;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockLadder;
 import net.minecraft.block.BlockVine;
+import net.minecraft.block.state.IBlockState;
 import net.minecraft.util.math.BlockPos;
 
 public class MovementDownward extends Movement {
@@ -40,12 +41,13 @@ public class MovementDownward extends Movement {
         if (!MovementHelper.canWalkOn(dest.down())) {
             return COST_INF;
         }
-        Block td = BlockStateInterface.get(dest).getBlock();
+        IBlockState d = BlockStateInterface.get(dest);
+        Block td = d.getBlock();
         boolean ladder = td instanceof BlockLadder || td instanceof BlockVine;
         if (ladder) {
             return LADDER_DOWN_ONE_COST;
         } else {
-            return FALL_N_BLOCKS_COST[1] + getTotalHardnessOfBlocksToBreak(context.getToolSet());
+            return FALL_N_BLOCKS_COST[1] + MovementHelper.getMiningDurationTicks(context.getToolSet(), dest, d);
         }
     }
 
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementFall.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementFall.java
index a82d874d..4b733284 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementFall.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementFall.java
@@ -49,6 +49,9 @@ public class MovementFall extends Movement {
         }
         double placeBucketCost = 0.0;
         if (!BlockStateInterface.isWater(dest) && src.getY() - dest.getY() > 3) {
+            if (!context.hasWaterBucket()) {
+                return COST_INF;
+            }
             placeBucketCost = ActionCosts.PLACE_ONE_BLOCK_COST;
         }
         double frontTwo = MovementHelper.getMiningDurationTicks(context.getToolSet(), positionsToBreak[0]) + MovementHelper.getMiningDurationTicks(context.getToolSet(), positionsToBreak[1]);
@@ -56,6 +59,11 @@ public class MovementFall extends Movement {
             return COST_INF;
         }
         for (int i = 2; i < positionsToBreak.length; i++) {
+            // TODO is this the right check here?
+            // miningDurationTicks is all right, but shouldn't it be canWalkThrough instead?
+            // lilypads (i think?) are 0 ticks to mine, but they definitely cause fall damage
+            // same thing for falling through water... we can't actually do that
+            // and falling through signs is possible, but they do have a mining duration, right?
             if (MovementHelper.getMiningDurationTicks(context.getToolSet(), positionsToBreak[i]) > 0) {
                 //can't break while falling
                 return COST_INF;
diff --git a/src/main/java/baritone/bot/pathing/movement/movements/MovementTraverse.java b/src/main/java/baritone/bot/pathing/movement/movements/MovementTraverse.java
index cd8d56d5..b92a021c 100644
--- a/src/main/java/baritone/bot/pathing/movement/movements/MovementTraverse.java
+++ b/src/main/java/baritone/bot/pathing/movement/movements/MovementTraverse.java
@@ -72,9 +72,16 @@ public class MovementTraverse extends Movement {
         IBlockState pb1 = BlockStateInterface.get(positionsToBreak[1]);
         IBlockState destOn = BlockStateInterface.get(positionsToPlace[0]);
         if (MovementHelper.canWalkOn(positionsToPlace[0], destOn)) {//this is a walk, not a bridge
-            double WC = BlockStateInterface.isWater(pb0.getBlock()) || BlockStateInterface.isWater(pb1.getBlock()) ? WALK_ONE_IN_WATER_COST : WALK_ONE_BLOCK_COST;
-            if (destOn.getBlock().equals(Blocks.SOUL_SAND)) {
-                WC *= WALK_ONE_IN_WATER_COST / WALK_ONE_BLOCK_COST;
+            double WC = WALK_ONE_BLOCK_COST;
+            if (BlockStateInterface.isWater(pb0.getBlock()) || BlockStateInterface.isWater(pb1.getBlock())) {
+                WC = WALK_ONE_IN_WATER_COST;
+            } else {
+                if (Blocks.SOUL_SAND.equals(destOn.getBlock())) {
+                    WC += (WALK_ONE_OVER_SOUL_SAND_COST - WALK_ONE_BLOCK_COST) / 2;
+                }
+                if (Blocks.SOUL_SAND.equals(BlockStateInterface.get(src.down()).getBlock())) {
+                    WC += (WALK_ONE_OVER_SOUL_SAND_COST - WALK_ONE_BLOCK_COST) / 2;
+                }
             }
             if (MovementHelper.canWalkThrough(positionsToBreak[0]) && MovementHelper.canWalkThrough(positionsToBreak[1])) {
                 if (WC == WALK_ONE_BLOCK_COST && context.canSprint()) {
@@ -89,9 +96,8 @@ public class MovementTraverse extends Movement {
             //Out.log("Can't walk through " + blocksToBreak[0] + " (hardness" + hardness1 + ") or " + blocksToBreak[1] + " (hardness " + hardness2 + ")");
             return WC + getTotalHardnessOfBlocksToBreak(context.getToolSet());
         } else {//this is a bridge, so we need to place a block
-            //return 1000000;
-            Block f = BlockStateInterface.get(src.down()).getBlock();
-            if (f instanceof BlockLadder || f instanceof BlockVine) {
+            Block srcDown = BlockStateInterface.get(src.down()).getBlock();
+            if (srcDown instanceof BlockLadder || srcDown instanceof BlockVine) {
                 return COST_INF;
             }
             IBlockState pp0 = BlockStateInterface.get(positionsToPlace[0]);
diff --git a/src/main/java/baritone/bot/utils/InputOverrideHandler.java b/src/main/java/baritone/bot/utils/InputOverrideHandler.java
index 99e59e3f..2e1f15a9 100755
--- a/src/main/java/baritone/bot/utils/InputOverrideHandler.java
+++ b/src/main/java/baritone/bot/utils/InputOverrideHandler.java
@@ -151,7 +151,12 @@ public final class InputOverrideHandler implements Helper {
         /**
          * The sneak input
          */
-        SNEAK(mc.gameSettings.keyBindSneak);
+        SNEAK(mc.gameSettings.keyBindSneak),
+
+        /**
+         * The sprint input
+         */
+        SPRINT(mc.gameSettings.keyBindSprint);
 
         /**
          * The actual game {@link KeyBinding} being forced.
diff --git a/src/test/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest.java b/src/test/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest.java
index 3033bb69..817e5a58 100644
--- a/src/test/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest.java
+++ b/src/test/java/baritone/bot/pathing/movement/ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest.java
@@ -19,8 +19,7 @@ package baritone.bot.pathing.movement;
 
 import org.junit.Test;
 
-import static baritone.bot.pathing.movement.ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.FALL_N_BLOCKS_COST;
-import static baritone.bot.pathing.movement.ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.velocity;
+import static baritone.bot.pathing.movement.ActionCostsButOnlyTheOnesThatMakeMickeyDieInside.*;
 import static org.junit.Assert.assertEquals;
 
 public class ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest {
@@ -31,6 +30,9 @@ public class ActionCostsButOnlyTheOnesThatMakeMickeyDieInsideTest {
             double blocks = ticksToBlocks(FALL_N_BLOCKS_COST[i]);
             assertEquals(blocks, i, 0.000000000001); // If you add another 0 the test fails at i=217 LOL
         }
+        assertEquals(FALL_1_25_BLOCKS_COST, 6.2344, 0.00001);
+        assertEquals(FALL_0_25_BLOCKS_COST, 3.0710, 0.00001);
+        assertEquals(JUMP_ONE_BLOCK_COST, 3.1634, 0.00001);
     }
 
     public double ticksToBlocks(double ticks) {