I think that MN 3 sport ref has this slightly wrong. I had a post about this the other day. Basic situation was last second shot A1(shooter) goes up, horn sounds, shot released, basket goes. At approximately the same time the horn sounds my partner is calling a foul and then counts the basket. I was trail so I am waving off the shot so the basket won't count.

In the thread below, I came to the realization that if the shot wasn't released before the horn there is no such thing as an airborne shooter read section 4-1-1 in rule book (NFHS). Therefore in my situation if foul is before horn we shoot 2 with lane cleared, if foul is after horn we don't have a foul unless it is intentional or flagrant. In either of these cases basket doesn't count.