Illegal hit on a defenseless player. 15 yards.
It's not RTK because there was no kick, so no automatic first down. (High school doesn't use AR's, but it's still common sense).
The definition of a defenseless player is "A player who, because of his physical position and focus of concentration, is especially vulnerable to injury." (2-33-16). This player clearly fits that definition.
If I'm looking at Caiden's recruiting video, I'm not impressed. I would think "Million-dollar body, 2-cent head."
Plus, Caiden.