[Camron Rust]

I'd guess that the shooter was back to the floor long before the ball fell back below the rim....gravity works on both the same.

Since the horn had sounded and time expired, the ball is dead the moment it is obvious that the try will be unsuccessful.

If, by some strange twist of physics, A1 floats along and crashes into a player after the try has ended and time expired, A1 could be called for a foul and it could put the defender on the line for 1+1 since the foul occurred after the release. A1 remains liable for fouling (and being fouled) after a release until they return to the floor.

This is practically impossible, however, to have the shot already missed AND to have the shot clock expire AND to have the shooter still in the air AND for them to crash into a defender who is outside of the arc.

All of that said, just call the shot clock violation.