https://www.youtube.com/watch?v=LA_4MJFExz4

clear aimbot. every time he aims down sights he is on target.  when he gets to far ahead in the game he begins pulling away from targets when shooting.  Also a wallhack towards end he goes prone behind counter then crouch. aims through counter starts shooting then stands while shooting killing enemy. 

Seems like a combination of a few things: spectator glitching (the kill from behind cover for example), the higher damage of HC and the strange weapon switching of gunmaster. All this combined give a rather odd spectator view. I do not see cheating here, just a school example of spectator buggyness.