He killed everybody within 2 seconds. I dunno. Is that aimbot? 
I’ve seen good players get a good amount of headshots in a row so a screenshot is not enough proof imo. You would need to get a recording of the players using software like bandicam and pubovl. but i’ll keep my eye out.
I’ll keep OBS handy. I have it with a key bound to it that I could produce video. Key times though are 8-11 PM EST.