If you ever want to see some absolute violence, just point a racist skinhead out to a non-racist skinhead. And skinhead brawling doesn’t stop just because the skinheads in question got old or started landing albums in Billboard‘s top 10. Over the weekend, Boston’s venerable beer-punk institution the Dropkick Murphys were playing a two-night St. Patrick’s Day stand at New York’s Terminal 5. And during a cover of AC/DC’s “TNT,” there was a mob of audience members onstage when singer/bassist Ken Casey (who, I guess I should point out, might not claim skinhead status; I’m not sure) noticed the guy, walked over to him, and just absolutely beat the shit out of him, before telling the audience, “Nazis are not fucking welcome at a Dropkick Murphys show.” Props to the rest of the band for not stopping the song until after the beatdown ended. Watch the fan-made video, which also includes wheechair-crowdsurfing footage, below.