Mr. Ford beat me to it with the rule. And Mr. Welsh posted a good post. Headbutting is a clear FM and Mr. Ford makes great points about would you rather the official lessen the call based on the circumstances? This kid was frustrated, he lead with his head.

You see heads bumping together as a result of wrestlers trying to get head position in ties and so on and he was not trying to gain head position. His arms were back and not reaching for the head, hands or arms (as they would be if you were trying to get head position to work your offense). He clearly lunged at his opponent. I believe it was the right call. An unfortunate situation for all involved but the right call nonetheless.