SteveRef702,
One thing that will help you decide if it's a foul is to "ref the defense." Watching the defense will help you judge whether the offensive player or defensive player committed a foul. Whether the defender established legal guarding position is critical in deciding who the foul is on.
In this situation, it sounds like A1 initiated the contact. If so, you either have a nothing or a player-control foul on A1. But since it's only slight contact, it doesn't sound like you had a player-control foul . If you were watching the defense, you would know if B1 moved into A1 or perhaps moved under A1 after A1 went airborne which would then be a block on B1 (if you judged that there was enough contact for a foul).
Z
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