Just like anyone on the bench is subject to sportsmanship rules and is under the responsibility of the coach, anyone participating with warmups is also under the responsibility of the coach.
If that were not the case, someone actually on the team could dunk and the coach could then say the offending party was not on the team but a guest, on a different team, or even a stranger....and you'd be left with nothing you could do even if they were going to be a player.
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