Maybe you should have highlighted that part
in red!
The rules don't
forbid any such thing in this case though. Because this can
easily fall under 10-3-7c (Player Technical) "A player shall not ... Commit an unsporting foul. This includes,
but is not limited to, acts or conduct such as ... Baiting or taunting an opponent. NOTE: The NFHS disapproves of any form of taunting which is intended or designed to embarrass, ridicule or demean others under any circumstances including on the basis of race, religion, gender or national origin."
If timing the dismount of your monster dunk so that you land on your opponent and ride him piggyback is not intended to embarrass, ridicule, or demean, I don't know what is.