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					Originally Posted by  mroyal
					 
				 
				FED Umpire Manual (pg 35) "...When an umpire observes a base running error, he should make no verbal or non-verbal statement that could tip either team." (I think someone mentioned that already, but it was a good starting point.) 
			
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 By not signaling you're giving the defense a clue that something is amiss.  This is exactly what the manual is asking you not to do.