I could be wrong on the individual, but I believe >XI< Crimson was trying to get under the map on MP_BR (Bridge) to demonstrate the map flaw. He couldn't do it and was asking another XI member to see if he could do it. He didn't succeed on a few attempts. I ran over curiously and did it on my first try to show them. It was my first time under the map, and I only went down because of their conversation. I don't typically actively seek out map glitches like that.
As for the wallhacking...I mean, all I can say is that I don't. I don't usually even get very impressive scores. I have made a lot of no-scopes lately, but, I don't cheat o.O
Regards,
Had to at least try