Randall, your confusion stems from the difference between "on the circle" and "in the circle". Only the jumpers are allowed in the circle. The non-jumpers may occupy spaces on the circle, with a couple provisos. Additionally, you can't assume that A1 and B1 are the jumpers.
When the casebook says A1 moves "off the circle", that means that A1 (a non-jumper) had a position within 3 feet of the jump circle and then backed up so that he was no longer within 3 feet of the restraining circle.
With that in mind, if you go back and re-read the cases, I think you'll agree with all of them. Hope that helps.
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Any NCAA rules and interpretations in this post are relevant for men's games only!
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