Hey.
Altho I am not entirely sure this is an exploit but i hardly believe, this is intended by blizzard.
So, basically when you are in a dungeon, and there is a mob you can loot from an aoe group (good with gorup pulling) you get to loot allt he items in the stacke vn those that were originally not intended for you, so several greys potions etc.
First contribution so be easy on me.
Cheers