Most cases I see are an assistant going to verify that they are tracking on the fouls. Briefly yelling out a defense, or set play. These two instances seem more common in my experience. However if the guy or gal is standing to much a quick word with the HC generally clears it up. I use them at timeouts occasionally to address little things like someone getting stalled in the lane, or a sketchy screen. Something like that can help if use sparingly.
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"The soldier is the army."
-General George S. Patton, Jr.
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