2017-18 NFHS Comments, POE's

[Freddy]

Originally Posted by BillyMac

I didn't know that a defensive player is not required to keep both feet on the playing court after moving to maintain position after obtaining legal guarding position with both feet of the floor inbounds. I always thought that if contact was made by a defensive player having at least one foot out of bounds, that it was always a blocking foul.

I've been schooled.

The phraseology explaining this situation may not be worded ideally, but there isn't anything here that would merit removal of 4.23.3B from the Casebook. It's not talking about putting a foot on the line or off the playing court in that sense. It's talking about jumping and in that way "leaving the playing court."
Pick up your diploma from the principal's office. Your schooling has ended. Long ago.

. . . or am I missing out on a joke here and overstating the obvious?