Just to answer Champ's (or is it TJ's?) original question, there is no jump ball violation for landing in the "other" half of the jump circle. So if jumping across the line creates contact that puts the other jumper at a disadvantage, it has to be a foul. If it doesn't cause a disadvantage, then it's nothing.
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Any NCAA rules and interpretations in this post are relevant for men's games only!
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