Where's My Head?

Zone: Azshara

He's here, {name}! Captain Grunwald is a high-ranking Alliance officer from Northwatch Hold, no doubt here to coordinate an assault on Orgrimmar with his night elven allies. We have observed him entering the tower southwest of here. I want his head, {class}. I want to send it back to Northwatch to drive a wedge between our enemies! I've sent a goblin assassin, Slinky Sharpshiv, to the tower but she hasn't returned. Go find her. And get me that head!