We use the same signal in the field on a 3rd strike - but use it when (and if) PU looks at BU. It's not a "secret" from everyone, but it DOES look better than the alternatives even to those that see it (and most don't). I believe it (and the pulled foot mechanic we use) also facilitates getting the call right quickly, which can be an advantage. If coaches notice or know what we're doing, more power to them - it shows them we are working together to get the right call.
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"Many baseball fans look upon an umpire as a sort of necessary evil to the luxury of baseball, like the odor that follows an automobile." - Hall of Fame Pitcher Christy Mathewson
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