If a student is highly volatile, unstable, reactive, and unsafe, there are a few things to bear in mind: (1) s/he didn't get that way overnight; (2) there must be many expectations the student is having difficulty meeting; (3) reducing those expectations -- Plan C -- is a very good way to get things stabilized; and (4) even if takes a lot of time and energy to stabilize that student, it's a lot less time and energy than that student is consuming when s/he's unstable.