Killing Two Scourge With One Skeleton

Objectives
Darkrider Arly at Blackwatch wants you to destroy 3 Chained Abominations with Burning Skeletons.
 * : burned (3)

Description
The workers in the Fleshwerks abomination lab have already completed a number of their creations. For now, the creatures are chained to the pillars around the edge of the lab, but if we do not act, they will march with the Lich King's armies.

Grasping arms reach out of the bone piles spread throughout the Fleshwerks. These arms belong to skeletons enchanted with the power of fire. Find and free these skeletons, then take them near the completed abominations and watch the show!

Rewards
You will be able to choose one of these rewards:

Progress
Have you destroyed the completed abominations?

Completion
Ah, good. There's nothing like the smell of roasted putrid flesh in the morning. That's the smell of victory over the Scourge.