Basket Interference?

[BigT]

A friend had this happen in a game.

A10 goes to dunk the ball. B9 makes contact with him in the air and U2 blows for a foul.

A10 has B9 under him and grabs the ring for safety. Ball goes hit the back rim goes up 10 feet and starts to come down. A10 continues to hold onto the rim as B9 is under him on the ground. Ball goes through the net not touching anything including A10 hands still holding onto the rim. What are the chances. Crew counts the basket.

Common sense says they got it right. I am looking through the book and cant find anything to dispute their ruling.

Did they get this one right?