First time ever basket interference call, was I correct?

[jkumpire]

Hope all is well folks, first post in a very long time here....

Working a JV tournament yesterday of all things and A1 hits A2 in stride for a wide open layup. A2 goes to dunk the ball but misses it. Ball goes up in the air off the back rim then he grabs the rim and pulls it down. As the ball goes through the hoop I'm calling basket interference on A2, with appropriate static from JV coaches who never see a kid dunk on their level

I am 100% sure I'm right here, but it's the first time I can remember a kid missing a dunk and the ball going in after he grabs the rim. Pleas enlighten me as to the correctness of my call.

Thank you.