No guys...
I'm 100% sure that my body is not visible while hidding.. And he is the only one to kill me. Of course after doing it 3 or 4 times, I leave that place as now he knows I'm there..
When I say that he shoots my powerballs, I do on purpose to shoot the powerball away from him (like to the sky), to test the aimbot behaviour... And there I see his char poiting up and down like crazy (3 or 4 times per sec).
I say this is aimbot behaviour because back in the days I tried a aimbot and it indeed directly aimed to all powerballs (which was not really useful - as is someone would shoot a powerball, my char would automatically lock on the powerball)
It's true that he does not do it always, but when he does, is suspicious as hell..