According to the National Post‘s Ampersand blog, our pals Crystal Castles “were involved in a melee with security while onstage in Barcelona early Sunday morning. Their show…had been marred by technical issues. At some point during the set singer Alice Glass went into the crowd and punched a security guard. She then climbed back on stage, and pulled out the kick drum and appeared to be about to heave it when a sound technician grabbed her. And that’s when her bandmate Ethan Kath jumped in and rushed to her aid.” (There is, of course, a YouTube video showing part of what happened.) As history shows, the band really doesn’t like sound problems.