I am unsure if this is a repost but i havent seen anything similar so here goes
I farm Mother trash on my frost mage, just ice lance spamming until it dies. Earlier today a hunter wanted to join in, and then i managed to bug it out.
NOTE: This requires 2 people
The kite class HAS to be something with an aggro drop, i have only seen this happen with a hunter however
First just go on as if you are solo farming, kite it down
But have the 2nd player waiting for you, and when the mob you are killin is at ~15% start wailing on it
one of the NPC's will almost immediatly start MCing the 2nd person, and this is where the bug starts
Have the kite class immediatly finish the mob he has been kiting and do his aggro dump. this must be done within 20 seconds of the MC channel starting.
Now You should notice the pack has despawned
Except Player 2 is still MCed!
So you now have a a single pull mob left over for the 2 of you to focus without worrying about kiting
tl;dr with a second person and good timing you can get 2 mobs instead of one.