At this age, they are more self aware in some sense and would understand why you would send them to a therapist/psychologist or for any sort of professional help. If you want to help this traumatized young man, then the most you can do to help is give him the opportunity to go for professional help– someone recommended.
This. Ignore the “Yiddishkeit” for now, that can only come after healing. The big step in healing would be seeing the perp punished for his actions.