Two Gymnasts Try A Crazy Stunt And Knock Heads

We don't know where this happened, but there's a YouTube video of two gymnasts trying to do a crazy stunt where they both flip around in the air right next to each other.  But they get a little too close and knock heads. 

The sound it makes is TERRIBLE.  Then everyone else in the gym comes over to see if they're okay . . . except for one guy who seems like he couldn't care less.