http://www.creationkit.com/%D0%92%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D0%B5_%D0%B2_Papyrus
edit: BTW I was there looking for a way to detect when the actor is being retained by the vanilla command (not SKSE).
So is there REALLY NO function to detect when an actor is restrained? Seems like that would be a obvious inclusion as there is a vanilla SET restrained function.