Yeah, I remember finding that glitch when I was working on that Challenge. It's been a while, though, so I don't remember if it was useful as an advantage. I'll probably redo that Challenge soon, though.
Have you ever seen the glitch on Biodome, where the Target closest to the extraction point just like falls off the map or something after the alarm has been raised, and you get credit for killing him? Lol.
NNiD: 44dane // GE Wii: [Great-Dane] http://www.YouTube.com/user/44dane/featured