lol dude... "Stu was threatening and wanting to start something" is not a legal defense. Do you understand how the law works?
Firstly, this was meant to be a scripted event, and the organizers have admitted as much:
Quinton "Rampage" Jackson has apologized and said that he is "very upset" after his son allegedly committed what organizers called "a selfish, irresponsible act of violence."
abc7.com
However, you are still required to stick with the script and the confines of your instructions. I'm absolutely sure they didn't tell Raja to slam him so hard you knock him out, and then beat him half to death while he's unconscious. The moment Raja went off script, it became assault. That's how the law works.
The only thing that will potentially save Raja is if the dude that was attacked decides not to press charges.