The F Yeah Fest takes place in Los Angeles this weekend and features sets from No Age, High Places, Abe Vigoda, Mika Miko, Negative Approach, and dozens of others. So you’d think that promoters Sean Carlson and Phil Hoelting would be in jubilant spirits as the festival rapidly approaches. But an incident after Radiohead’s Monday night show at the Hollywood Bowl, which Carlson and Hoelting used as an opportunity to flyer the F Yeah Fest, has soured the preparations.

Filmmaker Michael Reich, who created Videothing.com, was filming Carlson and Hoelting when they noticed a scuffle outside the Radiohead show. The threesome rushed over as security guards brutally ejected one fan from the show. “They’re strangling him – brutally,” said Carlson. In the ensuing mêlée Carlson was wrestled to the ground after intervening and Reich captured the whole incident on camera.

A chase ensued after Hoelting heard one of the guards say: “That shit's going to be on YouTube. We gotta get that tape.” Despite their heroic efforts to secure the safety of the recording, Reich and Carlson ended up getting badly beaten by the guards. The guards also attacked onlooker Zachary Dawes, who was thrown the tape during the chase.

A group of police officers were on the scene and didn’t lift a finger to help either of the victims—perhaps unsurprisingly considering the security guards at the Bowl are all off-duty LAPD officers. The tape remains missing and Reich has filed a police report on the incident. You can read a lengthy recap of the incident, as told by Randall Roberts, who was also at the scene, here.