Just now I was playing challenge mode on the Nuke York map as Sidewinder. I killed all of my enemies and Rock n Rule was the last one left. However we both fell of the edge of the map, I died, but Rock n Rule is DRIVING at the bottom of the level ( Instant death area)  unscratched.. WTF ?

Wow, so you've seen that glitch happen as well. I remember one time Bitchin Wheel's drove down there and she randomly blew up and died, kinda caught me off guard. However, that glitch hasn't killed me yet though; I still go to the weapons upgrade without any trouble as of this time.