One fight begot another, begot another, begot another…

After Khabib Nurmagomedov made Conor McGregor submit in the fourth round of UFC 229 Saturday night, the Russian leapt into the crowd and started another brawl, one that spilled in and out of the octagon. In a bloodthirsty sport with bloodthirsty fans, that appears to be just the beginning of a wild night in Las Vegas, which featured Russian supporters and Irish supporters facing off.

Various videos have surfaced in the hours since of grisly, bare-knuckle fights, many featuring fans wearing their country’s flags like capes.

Real-world UFC, the octagon and rules gone. The worst footage is above and is graphic, especially for the McGregor supporter about 1:50 into the clip.

Nurmagomedov apologized after the melee, which was the culmination of a fight hyped with racial and political tension.

“First of all, I want to say sorry to Athletic Commission, sorry to Vegas,” he said. “I know this is not my best side. I’m human being.

“I don’t understand how people can talk about I jump on the cage. What about he talk about my religion? He talk about my religion, he talk about my country, he talk about my father. He come to Brooklyn and he broke bus. He almost killed a couple of people. What about this s–t?”