yeah, his sensitivity is def. high, look when they're in the covered area, and he turns around real quick. though, that could have been an aimbot, it didn't look like one, unless he has a toggling aimbot bound to a key other than fire, and set for body. he'd look at someone, tap the aimbot key, then release (to minimize jerking) and from there aim and shoot normally

edit: but that's not very likely. i'm inclined to say no hacking