You want control of the on/off on the field. I learned a secret from Red Cashion about mics. There are times where using the mic you can really do a good job explaining to the crowd to calm them down, but there are also times where you don't want them to hear what happened as it will make the crowd worse. The trick is for all of a sudden the mic "malfunctions". Simply tap the switch and the crowd assumes a malfunction and all you do is move your lips and signal.
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