That's one method in which Satori and Tyrael will show off their abilities. Namely, Tyrael's ability to command other demons, though alone he won't be able to take over Zaad. But with Satori's help, it could be possible. That being said, best they could do is get Zaad to fight the other demons; having him hunt down the perpetrator would be a bit of a stretch, since as of the moment, no one aside from Khan knows who the cause of the rage is. But at least Zaad won't be attacking students and teachers. Once Fallen gets her things up I'll shift the scene some, you may want to go ahead and write about how Ssarak responds to the situation, Commander.