Fumble or not?

[youngump]

Originally Posted by ajmc

A perfect example of the difference between being ignorant, and stupid. You have the opportunity to correct your son's ignorance by providing him with the necessary, and relevant, information so he can reach the correct conclusion. If he refuses to consider, and ultimately accept, that correct information....you may have a bigger problem.

I just lurk here (different sport), but I looked up the NFHS rule for ending a period and I don't see anything that would make the son wrong. Can you provide me a reference?