Is it a backcourt violation or a basket?

[Alligator Bag]

This play happened in a regional tournament game in our area and I need some input. A1 inbounds ball a midcourt. A2 recieves pass in frontcourt and proceeds to drive the length of floor for an uncontested dunk on the wrong basket. The officials don't blow whistle until after he dunks ball. They huddle and decide that he caught pass in frontcourt and going the wrong way have a backcourt violation, no basket. B's coach goes ballistic and wants basket to count for him since they didn't kill the play till after he dunked ball. They award B the ball at midcourt and go on. A fellow official argues that if they went back to violation and wipe off basket, then they should also penalize the dunk since it happened on a dead ball. Another also argues that since it is NOT a correctable error, they should have let the play stand and give ball back to A for throw-in and bite the bullet since they didn't blow the violation when it occured. All are interesting scenarios and even more interesting take on the rules. Any input would be appreciated.