The day they bury T'chali and leave him to die, it was Grimnok Battleborn that led them. And the next day it was Korgaah that come south to raid and kick T'chali in the head.
I want them dead!
You will find Grimnok atop the Southmaul Tower in Bloodmaul Outpost. You will find Korgaah in the top of a building at the north end of Bladespire Hold. Korgaah has sober defenders, so use the brew to distract him away from them, because they won't drink.