@Dude
I don't believe that his hacking because, first of all, since his a lager, u didn't aimed properly at him. Since he lags u should aim ahead of him and not the character. The reload hack is caused by lag. He slows down in your screen and when he comes back to normal, he just shoots those shots that you haven't seen him shooting.
I will see if this is all right from your side when I next see him.

P.S. Can you tell me what's his ping to give me an idea where to shoot?