Thats not a hack, cheat or a script. The reason why it looks like he's lagging is because that pillar in 4way is a bit weird, and you can kinda clinge to the side of it if you look in the right way, you will keep on falling a bit if you stop pressing any of the WASD keys.
This same thing has happend in another map, so It's not a lag script just an error in the maps or perhaps the game. They are killable if you just jump of the top and fall down to kill them.
No ban needed here, thanks anyways.
dbb