Kinda similar, but can an umpire object to a coach talking to his/her defensive players in a huddle after they come off the field and before they enter the dugout? Had an umpire put a stop to that in a recent tournament. I guess one concern would be that if you're outside the dugout, you could get hit in the head by something. But don't think there is a rule. I assume a particular tournament can make it a rule. Doubt that happened either, though.
This was a point of emphasis a few years back for high school ball (NFHS). As you described, it is a safety issue for the teams to meet/huddle in live ball territory as the defense is warming up between innings. It is not an issue that they are meeting, just that they are in live ball territory. We are instructed to ask them to move behind the fence.
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