How did rayray from mindless behavior break his arm?

When Mindless Behavior was on the scream tour and they were rehearsing. Ray Ray happened to be unlucky and popped his joint out of place.

If you want to see something funny, go to YouTube and type in the following;

Princeton teasing RayRay. You have to watch the one that says inside of parentheses, try not to laught. It's hilarious.

Thanks.