Disrespect is at the root of Chris Brown and Frank Ocean’s brawl. Following Sunday night’s altercation at a West Hollywood recording studio, more details are starting to emerge about the R&B singers’ showdown.

TMZ is now reporting that Chris lost his cool and threw the first punch after Frank disrespected him by refusing to shake his hand. According to an eyewitness, Frank laughed at the gesture, which triggered Chris’ reaction.

Both of their crews started brawling, moving from the parking lot into the studio. “They managed to break almost everything in the room and scare all of the staff members working,” recalled one witness, who described the destructive scene.

The receptionist called 911, but Chris fled the scene before police arrived. Frank spoke with cops and told them how he felt “blindsided” by Chris.

When Breezy arrived at the studio earlier in the evening, Frank had taken the prime parking spot, typically reserved for big artists. Chris felt that he deserved the space and that Frank was disrespecting him by taking it.

The Odd Future crooner later tweeted about the situation. “got jumped by chris and a couple guys. lol,” he said. “cut my finger now I can’t play w two hands at the grammys.”