NCAA OOB Case Play?

[Scrapper1]

I had a play tonight that I'm 100% certain I got right. But the coach who disagreed with me could not be convinced. So I'm hoping there's a case play that someone can share with me. Here's the play:

A1 makes a throw-in pass from the endline. A2 steps on the sideline boundary and catches the throw-in pass while standing out of bounds. I awarded Team B the ball at the spot where A2 caught the ball, with no time having elapsed off the game clock.

Coach was adamant that Team B's throw-in should be from the spot of A1's original throw-in. This is covered in 7-6-2 and 9-5-2b. But there's no case play that I can find. Anybody help me out?