Invisible GM

Everyone who plays Combat arms knows of GM's, they are those guys in game rooms that will ban you instantly for hacking/glitching etc. But recently, during one of the recent patches, nexon began to hide GMs inside game rooms. The GM's are able to enter rooms that are already full or lock/closed etc. Basically, they genneraly sit either on the edge of the map (like in a corner) or can be found outside the worlds bounderarys. The annoying things is that they are invisible. The only way that the GM's have been conformed, is by a group of hackers, they used various hacking methods to find invisable hit boxes within the map, and apon shooting these hitboxes, they where immediatly looged out of Cobat arms, and their accounts either suspended or banned.