Unholy DK's LOVE to AOE grind, don't they?
But the problem is some mobs are larger than others so they die on top of the smaller mobs. Or maybe even some mobs die on top of a herb you want to pick or a quest item on the ground.
HAVE NO FEAR!
Unholy DK's can use the "Corpse Explosion" technique to clear the mobs and make them into smaller parts to loot. This is really great if you want to pick an herb but a large mob is on top of it. Not really the greatest exploit but it is an exploit since Blizz designed it for damage dealing =]
Thanks for the read!