That rule is intended to prevent a team from gaining an advantage from going OOB.
The main situation where I've seen (and called) this violation is Team A player running OOB on the offensive endline from one side to the other to get open on the wing without running into traffic in the lane.
I'd be hard-pressed to call a violation on your sitch. By leaving the court, A1 is actually leaving his team at a disadvantage... why stop the game and take the advantage away from Team B?
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