Seems harming that guy was a really bad idea. His girlfriend is gonna kick your butt.
A violently protective girlfriend essentially acts like a much younger Mama Bear, except her triggers is any harm to her mate rather than to the kids; note that this inverts the usual expectation that the boyfriend is violently protective of the girlfriend (which may still be the case).
Violently Protective Girlfriend has been suggested to play 2 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.