Another Backcourt Question

[DrC.]

I had this one yesterday. A1 shoots a 3 misses off front rim and bounces hard back, where A2 deflects ball into back count. A2 never had control of the ball. But he did deflect in a manner which made it easiest for him to retrieve. I (trail) did not call Backcourt because once shot went up, no possession (in my mind) was made until A2 picked up ball in backcout. Obviously coach B wanted BACKCOURT. Was I correct???

Also, Is division line part of Frontcourt or Backcourt ?

Thanks again.........