Ah, gotcha Brother. I figured, but wasn't quite sure. Regardless the game I was in was ridiculous, aliens and predators dieing so fast it was unbelievable and it was generally by one or two marines. I mean, if anyone got near em and just even walk in their path, they'd instantly die.
OT: Hackers, like the above user said are everywhere. There is no escaping them I'm afraid. Sad, but there will always be one in any game. Nothing anyone can do, cause they'll find ways around ANYTHING.