I dont think they would be able to do that while arming, but that doesnt stop everyone else from standing next to them so the grenades and rockets can't hit them while they are arming. I see the shield being a problem. Sounds cool for the game, but not really for multiplayer. Hell, I'm just hoping they got rid of the Newb combo. But since I dont really think the BR is going to be in this game, instead a newer version of the assault rifle, this may or may not be a problem. But oh well, there is always the spiker, and the needler is supposed to be better now also, or so I have read.