I realize this isn't news to some people, but for those who don't already know (and i know many don't because i'm constantly telling my raid groups about this), running the lamp section with icebreaker is a HUGE help. You can turn around and no scope/quick scope into the crowd of thrall and it will destroy most if not all of them, not to mention you get the +2 Agility. Give it a try.
Edit:
MIDA sounds like another great weapon to use for this. Unfortunately though, i do not have that gun. So i can't try it out. :(
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Is it just me who has a their frame rate drop when they shoot the whole pack of thrall at the last lamp (well at least 'near' the last lamp) my game doesn't crash it just lags BIG TIME then I'm fine????