I think this HM boss is fun with the bug ^^
if your healer is a trooper like me, LOS the spawning ads behind a wall (going back out and behind a wall 24/7 nonstop) will make this boss manageable.
If they get too close, you just retreat to another wall. Might be hard with PUG and not using VoIP.
Even manage to do this instance 2 man, me and a 47 vanguard. Was lots of fun. Ofc normal then.