Watch Jay-Z get violently attacked by Beyonce’s sister Solange Knowles

According to TMZ, this is a surveillance tape of Beyonce’s sister Solange Knowles trying to beat the piss out of Jay-Z in an elevator at a Met Gala after party. But why?

A man, assumed to be a bodyguard, tries to hold Solange back, but she still gets in a few shots before the bodyguard hits the emergency stop button. Beyonce, meanwhile, appears to just stand there doing pretty much nothing. No word yet on what set Solange off, but TMZ also has a photo of her looking pretty pissed leaving the event.

Related: Just how ‘influential’ is Beyonce? She has her own church and religion now