Over and back??

[BBallfanatic]

Ok... This is probably simple for most of you but I'm feeling like I'm not quite understanding this concept completely... Team A just inbounded the ball after a basket by team B. A1 is closely guarded in the back court by B1. B1 gets a piece of the ball in Team A's back court and rolls past the division line (where it would then be Team B's back court). Partner calls over and back. Coach B complains it wasn't... In my interpretation it would be a no whistle too because team B didnt not have team control... Or am I off base???

Another scenario:

Team A dribbles past division line and stops at the key where he is guarded by B1. A1 loses control of the ball so A1 and B1 go for the ball. The ball hits B1's knee and rolls past the division line into Team B's Backcourt where it was recovered by B1. Over an Back?? Or same as above because of team control??