A guy running around on Domination tonight, you could not kill him, but he could not kill you either, weird as hell, but very annoying and distracting!
Waaaay too many hacks in this game already!
Did you take the time to report him/her in-game? This is what IW is requesting of us, the community. Here is a guide on how to report a player via Activision Support.
CODBlackIce | Global Forum Moderator
Modern Warfare 3, Black Ops II & Ghosts