If you're polishing off Nef the Hyper-Nerfed, be aware that you will not be able to get your pet to attack either Ony or Nef at all. No matter the pet stance, no matter the command, even typed /petattack. It will just blink and be on you. You'll get to use your pet when you're on the pillars. That's all.
I haven't had any problems with any other bosses or mobs anywhere. And I didn't have this problem last Thursday on Nef.