This makes it a lot easier to run UK as you will only have to kill 2 packs of mobs at 80 when running for the Ebon Roses. I haven't tried with a hunter but I assume the hunter pet mechanics are the same as the warlocks.
Run to the end of the hallway and when you get to where the ring with the walls of fire are stop.
Look to your left and you will see a wall of fire you can't run through. Run as close to it as you can and stand there. Try to send your pet in to attack, if it doesn't work right away try going up and down the flame and trying to send it in.
Once your pet is sent in the mobs will run to you and the flame wall will disappear, allowing you to kill the 3 and skip 2 other packs.
Hope this helps, this is my 1st contribution after so much help from these forums.
VIDEO:
[ame="http://www.youtube.com/watch?v=H6HqWnnzqrU"]YouTube- Pet exploit.wmv[/ame]