Seems harming that guy was a really bad idea. His girlfriend is gonna kick your ass. A violently protective girlfriend essentially acts like a much younger Mama Bear, except her Berserk Button is 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. Sometimes, if she herself doesn't treat her boyfriend exceptionally well, there can be a variant what can be summed up as, "Hey, nobody picks on him but me." Examples of Violently Protective Girlfriend include: