This has been discussed before but no one gave a definitive answer.
To me it would be a game management issue. If they are not team members I would have game management (or the coach) direct them to leave the court. I would think the JV coach wouldn't want varsity players interfering with JV warm-ups.
If it continued I suppose you could try to conjure up some sort of team technical and/or indirect technical against the coach but good luck finding a rules reference to back you up.
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A-hole formerly known as BNR
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