[BillyMac]

Originally Posted by Indianaref

Ball goes OOB in Team A frontcourt, officials are unsure of who it went off of so they go with the arrow which belongs to Team A. Is the throw-in spot where the ball went OOB's or is it now treated as a held ball and goes to one of the four spots?

Great question.

There's a similar situation in a 2023-24 NFHS Basketball Rules Interpretation, but with a timeout rather than held ball AP arrow.

In the interpretation one goes to the "original" reason for the whistle, thus not one of the four "special spots", but the where the ball went out of bounds.

2023-24 NFHS Basketball Rules Interpretations

SITUATION 1: Team A has possession of the ball in its frontcourt when the ball is deflected out of bounds by Team B. The ball exits the court along the end line close to the right sideline. Team A is granted an inbounds at the location where the ball exited the court. While Team A is trying to inbounds the ball, Team A calls a time-out. After the time-out, the inbounds spot (a) returns to the same spot; (b) moves to the designated spot 3 feet outside of the lane along the end line. RULING: (a) Correct procedure; (b) Incorrect procedure. COMMENT: Since the ball was not on the court, the time-out did not create a “stoppage in play” that would move the inbounds spot to one of the four designated spots. Play will continue from the inbounds spot established by the deflection of the ball by Team B. (7-5-2, 7-5-3a)

I'm assuming that it's the same for this situation, out of bounds and held ball AP arrow, not one of the four "special spots", but the where the ball went out of bounds.