We had to clear the room five or six times for this guy to pop.
He popped twice back to back, and then again after three more room clears.
He has a punch that throws you halfway across the room. If you don't have the room clear when he throws you, it can send you into aggro range of other mobs in the area.
Though he can probably spawn from any of the "bloodthirsty beasts" in the room, all three of his spawns for us was in the same spot, next to the ape on the crate, towards the center.