So everyone in the server was too stupid to say hacks without reading the environment.
I didn't accuse him for cheating surely, because bhopping can be done by skills, and backstabs too.
I asked him and he said there are no such hacks like that(knife tricks).
But what I wasn't sure was that backstabs which had rare headshot marks.
I rarely see that kind of knifing(not ordinary backstabs) so yeah I reported him.

I think he didn't mean himself