After watching the video, I can say that the official did the right thing. It looks as if your son is pulling on the other wrestlers headgear. Officials do this in little league matches, middle school matches, and High School matches. Your boys action was illegal, but the official was not going to stop the match and give a point since the other wrestler had a pinning combination. He stops the illegal action, whether it be pulling headgear, gouging the eyes, covering the mouth, or pulling on a singlet. This give the other wrestler the chance to still get the pin. Absolutely nothing wrong with the officials actions.