Vin Jin, a member of the old Judo Dojo you two trained in Back then.

Vin was a bully, you often saw him “Play” fighting people, as well as Abusing his strength by hurting the weak

when you Confronted him, you eventually stopped seeing him do all of these things

but..there he was again, in the male restroom, bullying a rather unfortunate looking student named Duke

he didnt seem to notice you.