--- a/src/proto2/Physics.cc	Tue Dec 02 00:48:21 2008 +0000
+++ b/src/proto2/Physics.cc	Tue Dec 02 00:56:31 2008 +0000
@@ -231,15 +231,13 @@
  * Direction given as normal of that wall
  */
 void PhysicsObject::bounce (Vector normal) {
-    if (normal.length() != 0) {
-        // Engine::log(DEBUG, "PhysicsObject.bounce") << "Velocity: " << velocity;
+    // normal.sqrLength can't be 0 when got from getNormal()
+    if (normal.sqrLength() != 0) {
         Vector nvel = velocity;
-        //        Engine::log(DEBUG, "PhysicsObject.bounce") << "New Velocity: " << nvel;
-//        nvel = nvel - ((1+COLLISION_ELASTICITY)*((nvel*normal)/(normal*normal))*normal);
-        
+        // We project the velocity on normal and remove twice that much from velocity
         nvel = nvel - ((2)*((nvel*normal)/(normal*normal))*normal);
-//        Engine::log(DEBUG, "PhysicsObject.bounce") << "Projection: " << nvel;
         velocity = nvel;
+        // We lose some of our speed on collision
         this->velocity *= COLLISION_ELASTICITY;
     }
 }