I'm assuming this is a bug - in the fight the boss casts a room wide aoe Doom that will 1 shot you if you don't run to a specific glowing stone slab in the room.
Its enough to run there yourself every few seconds while killing the bees and avoiding the other aoes and dpsing - are we meant to also have to direct our pet to each slab during the fight as well, or is this a bug that the effect hits them at all?