Hello!
In my 10 man raid we struggled a bit on this boss mostly due to the void (aka the ball) hitting totems and pets when trying to get him into P2. We found a strategy to put totems on the side and I don't really know how our warlocks and hunter did with their pets, but the ball could hit imps and hunter pets from time to time.
Is it really supposed to be this way? I mean, if a warlock or hunter would dismiss their pets their damage would be lowered quite a bit. Got the boss to 4% in a semi-casual guild a couple to three times, struggled with the healing a bit (a very low geared healer).
As I recall, Blizzard are pretty good fixing such things if it isn't intended, but I can't see how it should be this way. Anyone else had the same problem?