Wouldn't be surprised if it were intentional. After those longstanding rumors of Brandy talking bad about Beyonce years ago, it seems Beyoncé stays out her way. She seems to do that with a lot of celebs though who do her wrong. Typical Virgo spirit though...smile and say you're over it but deep down still harboring a lot of pettiness and resentment. I also noticed that each time Beyonce came backstage for photos, it was during moments when Brandy was performing her first half of the shared set. Who knows though...I'm sure they saw each other in passing and said hi but just weren't able to be pictured.