I'll give this one a try:
You are getting mixed info regarding if the team has FC or BC status (frontcourt or backcourt).
Team A has FC status. The ball is already in the FC, being passed around, dribbled, among A players. If anyone from A touches the division line, or goes over it, while touching the ball, it is a BC violation. The division line is entirely in the BC. A needs only to have a heel or toe or ball touch the line. However, if B tips the ball last (in A's FC), then A can touch the ball with no violation.
Now, let's say B rebounds the ball and is heading toward their end. B dribbles up their BC. B will not get FC status until the dribbler has both feet and the ball over the division line. B can actually straddle the line and dribble in the BC with no violation because he has not gotten FC status yet (until all three occur).
Another thing to consider is if B is receiving a pass from his BC rebounder and he is at the division line. He will not get FC status until both feet and the ball cross, except if he catches the ball on one foot in the FC and the other foot in the air, he has FC status. A step back (with the non-pivot foot) into BC will be a violation.
And also, you muct consider throw-ins. A team must gain CONTROL of the ball after a throw-in before they are able to commit a BC violation. So, if A1 throws-in the ball in his FC, and A2 tips it into the BC, then team A can still touch the ball without violating (there was no control). Also, team A with a throw-in in their FC can throw the ball to a player in the BC legally.
One other situation. If team A is heading into their FC (say on a fastbreak) and A1 is in FC and he decides to pass it back to A2 who is running from BC, then A2 must have FC status before he receives the ball. If A2 jumps from his BC and catches (or touches) the pass while airborne, he has a BC violation. His status was where he was last touching the floor.
Hope this helps. There are more the BC violations than meets the eye!
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