You don't. You stand back there, try to keep the batter close to the box (preferably with a foot in there), perhaps clap your hands a couple of times during all this dead time as to try to keep people moving. A word with the offensive coach in between innings to shorten up the signs and keep his batter close will do. Or talk with the defensive coach if his pitcher he is the one delaying. Try to solve it before having the pitcher pitch with no batter or adding balls to the count. If it doesn't stop, then be prepared to do this, only if really blatant.
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