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Hey guys,
This may have been posted before and im sorry if so, but i wanted to share this with you anyway.
This glitch works on most maps and you have to have two players, so anyway what you do is get your buddy and you to go into a room that only has 1 entrance and what u do is get you or your friend to stand in the door way and shoot the enemy's and if he is to go down then he will block the enemy's from coming though the door. the other person lies down around the corner and keeps reviving the enemy. the guy who is lying down can never be shot.
let me know, i got to level 40 on resistance by doing this.

(die because got bored.)