The kid was angry, but you are only making it worse with this punishment. The appropriate thing to do would be to send him to a competent guidance counselor and work through his feelings then send him on a path forward. Not really even a "punishment " but a correction. Before reading what happened I would have said that even that would be too much, but having read it, I don’t think it would hurt to counsel him though his feelings. I doubt Tennessee has many competent guidance counselors though.