It's not really clear why it heated up so fast, but Nick Diaz (cornering Jake Shields) and Jason "Mayhem" Miller (cornering Dan Henderson) just got into a wild brawl in the cage after the Shields-Henderson main event. Mayhem got in Shields' face, then Shields pushed him, so Diaz jumped in beat the hell out of Mayhem while Gus Johnson, after bizarrely trying to excuse the spectacle as a minor "boys will be boys" moment, nearly had an aneurysm screaming "Gentleman, please! We are on national television!" Diaz and other Cesar Gracie Team members were soccer kicking Miller in an ugly sight as the cage quickly filled up.
The Diaz brothers made things worse with a Facebook post:
For those that people think this shit's a game. Mayhem Millet trying to steal Jake's spotlight? Walk up on our camp like that? The clown got beat down.
Video of the brawl:
An animated GIF of the brawl is available for internet meme purposes after the jump.