How the hell do you kill this guy? Me and my friend will get him down to a low health and he will just become a Black Hole Thresher and down us, while we can't do anything to counter it. How do you stop him from doing it?
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My friend (Axton) and me (Siren) always played behind the glitched rock. Until, last night we actually went around the area killing him. He has the CC and I'm a great healer... it works pretty well :p