Ok, this exploit requires a priest. Works on newest mangos (rev 6561)
Requirements: Priest with shadow word pain, power word: shield, humanoid creature.
1. Bubble/Shield
2. Cast Shadow Word Pain on humanoid creature
3. Mind control it
4. Wait for a few secs
5. Cancel mind control
6. Hit the humanoid with a melee attack and back off.
7. Enjoy your free kill (Don't be in meelee range or it will hit you)