He was already in the server before I joined it seemed. He was spawn camping Blu team and was playing sniper. I then went sniper and would kill him at times then I noticed that he would hit some pretty weird shots with such quick reaction speed. So I then decided to go spectator mode before I reported the issue to get some video evidence. It was pretty hard to tell whether he was hacking or not because when he would use his sniper rifle of any kind he wouldn't twitch but when he would use his smg it was noticeable. This went on for a while then a mod came on and proceeded to constantly kill him. It seemed he had turned off his aimbot or whatever he was using but it looked like he was able to see through the wall still. I caught him aiming through the boxes at the head of the player he was fighting. The demo has all the evidence in it.