PC foul under/near basket?

[Ridge Wiz]

A friend & I have a disagreement about a PC foul when the defense is under the basket. I told him NFHS is different than NC2A or NBA.
I say it doesn't matter were the defense is as long as he/she has established a "legal" guarding position.

NFHS case book, pg30, 4.23.2: B1 jumps in front of dribbler A1 & obtains a legal guarding position with both feet touching & facing A1. Dribbler A1 contacts B1's torso. Ruling: PC on A1.
My friend says, "If B1 is under the basket there is no PC."
Of course, I know he is wrong but, this is only text I can find that would support my position.

Am I overlooking an area that would provide a better situation? Thanx