Hello guys
Due lag issues we found hard to get this guys down in HM the last night, but we found a glitch where you can stand without get touched and dmg it still. So this should be nice if you found the boss going in enrage wihtin 1-2m (Note: It gonna take almost forever if he stack 10x armor buff).
Once you enter the room theres 2 little ramps (from main console to 3 consoles) where you can hide wihtout reset him and you can still ranged dmg.
So the ideal way to use it is if the boss is still with 15-20% and you're not able to get another fire, the tank should move under one of that ramps and you wil get it easy.
Cheers!