Mark, I disagree. If you have a block at the APEX, and A1 comes back to the ground, how can you have a travel? SHot clearly prevented from being released, palyer returns to the floor, jump ball. (if I'm not reading the situation right, forgive me.)
And when I talk about the loose ball, I'm merely saying that
....
Oh, H*ll, I don't know what I'm saying.
Just make sure
the play is allowed to finish. In this play if they come back to the ground, even if you wait a second after they do,
(ball loose,whatever) you're not going to get an argument from most players and coaches on the play. (They might argue for a foul, but so what?)