I was playing Crysis 2 when I got killed by a certain person (Pyc_KJlaH_BaHbka)
I noticed that in the killcam, he needed just one bullet to kill me. He also made the climbing gestures while normally walking and it seemed like lagged really bad.
I didn't think too much of it since he might indeed have just been lagging.

I decided to start recording after getting killed again, so here's the video:
http://justin.tv/trickboss_the_second/b/282811546

You can see him in action at 0:55 and 6:00.

P.s. Don't mind the occasional commentary, I livestream and people joined my chat thinking I was broadcasting :3.