It sounds like he has taken it into consideration, since you are still on the schedual. Keep in mind that you are entitled to reasonable accomodations, like needing to go to a quiet room for a few minutes, after an exerience like that. Your employer does not have to tolerate you "ranting" at supervisers. It wasn't your boss's fault that the teen behaved the way he did. The way this teen treated you is an example of why he's in that group home.

Had you, "accidentally," hit the teen resident, you could have been arrested for battery. Before a judge, you would be entitled to plead temporary mental incapacitation. That would possibly hold up as a defence. However, a judge would ask why you chose to work in an environment where there is a hugh risk for that kind of thing happening. You would probably then be court ordered not to work in group homes for teens.

These homes are tough places to work in, and your employer probably has a tough time recruiting staff. For that reason, they will be tolerant to some degree of an employee getting upset from time to time. But it's a limited tolerance.