The boss and his little homo buddy start goin back and forth with their immune beam....im only 627 right now, and it usually takes most of the timer to kill one, unless they start doin that....then its pretty much over. Like 3 attempts in a row have ended like this. Its pretty frustrating.
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Must be your matchmake coz at 627 you should be getting through it easy ,did mine last week with a team I was only 619 roughly ,630 this week did it twice in a row,(find a team if possible buddy)