diff --git a/content/pong/ball/bouncing/motion_engine.md b/content/pong/ball/bouncing/motion_engine.md
index b501be7..f4726a4 100644
--- a/content/pong/ball/bouncing/motion_engine.md
+++ b/content/pong/ball/bouncing/motion_engine.md
@@ -83,6 +83,9 @@ Next, in a separate block, let's consolidate our MotionMessages per Entity.
 
     ...
 
+    _spatialHash.Clear();
+    _moveAmounts.Clear();
+
     foreach (var entity in TrackedEntities)
     {
         ...
@@ -235,7 +238,7 @@ Now, in the final block of our **MotionEngine**, we can perform our collision te
     {
         ...
     }
-    
+
     foreach (ref readonly var entity in ReadEntities<PositionComponent>())
     {
         ...