[CoachP]

Originally Posted by Nevadaref

Right ruling, wrong reason. This was a throw-in violation, not an OOB violation. Therefore, the ball goes to the opponent at the original throw-in spot. (Rule 9, Penalty Section 2)

Also, the rule that the OP should cite for the questioning coach is the one which states when an AP throw-in ends.

6-4-4 "...The direction of the possession arrow is reversed immediately after an alternating-possession throw-in ends. An alternating-possession throw-in ends when the throw-in ends or when the throw-in team violates."

Perfect, thanks!