Hmmm, well thinking a little more, I think I'm on board with at the disposal of the thrower now. Due to the fact, that if it wasn't set at that point, and the thrower broke the plane and team A grabbed the ball and you had a held ball...who would you give the ball to if the AP hasn't been set? Using the theory of once the throw-in is complete, if you had a held ball, you'd have to re-jump it since the AP wasn't set.
I'm going with at the disposal of the thrower.
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