"black on black crime" in UFC

This may seem a kind of trivial take on race, but I was reading an account of an Ultimate Fighting Championship (mixed martial arts--in other words, kicking, slugging and wrestling) bout. The first thing that caught my eye was the photo of a black guy and a white guy, nose to nose, eye to eye, both trying to look threatening. It turns out that the black guy won: "Quinton 'Rampage' Jackson was far from spectacular, but he pounded out a unanimous decision Saturday over Keith Jardine at UFC 96 in Nationwide Arena that landed him an even bigger prize."
"Jackson will get a chance to fight Rashad Evans for the UFC light heavyweight title May 23 at UFC 98 in Las Vegas after his workmanlike victory." The champ, Evans is also black leading to a funny, race-conscious quote from Jackson, seeking to hype the upcoming championship fight. Here's how the article puts it:
"Jackson came out unscathed and was clear about his intentions. He got into a nose-to-nose showdown with Evans in the cage and said, 'It’s going to be black on black crime,' before stomping away."