Not sure if it is a bug or anything, but was running a legendary DUA with my clan. We managed to get to the the final bit, cleared all the other mobs and had jsut boss left. We tried all sorts including the apparent blinding method to disrupt his emp thing but after about an hour we still could not break his backpack, the blinding was not disrupting his EMP at all and his backpack was jsut seeming to be a healing machine set to overcharge and there was nothing we could do. He was even at the "time limit" point where he had special ammo and still couldnt do anything to him.
I'm needing to know if there is anything specific we need to do to break his packpack, or if we come across a bug that 4 wipes still didn't change (yes we were persistant and wanted to complete our first ever Legendary run) and caused us undue stress that made us eventually just call it as the fun had stopped.