The restriction is for "Moving ONTO" the circle, NOT moving OFF the circle....AND...B1 can move OFF the circle and go behind A1....IF...B1 is 5 feet off the circle...remember that each position, like this one, is 3 feet deep... Read case book 6.4.2.....If B1 would move off the circle, as the official is about to toss the ball, and then move directly behind A1 (who is on the circle) = violation.
Once the ball is tossed....the restriction for moving onto the circle is over....but non jumpers cannot break the plane of the circle until the ball is touched by one of the jumpers...
Hope this Helps....JO
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