Someone brought this question up, and I'm not quite convinced of the answer that I got.  Thus, I throw the question out to you...
	Quote:
	
	
		| ASA 6-1-E: The pitcher must not simulate a legal pitch while not in contact with the pitchers plate. EFFECT: A dead ball should be called, an illegal pitch ruled, a warning is issued, and repeated action would result in the pitcher ruled illegal, and removed from the pitching position.
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 I was told the proper mechanic for the PU would be to signal DDB and call "Illegal."  Then, kill the play with a "dead ball" signal (verbal and visual).  Then, step out and warn the pitcher.
Why bother with the DDB signal?  If the effect is a dead ball, why not skip the DDB signal and go straight to "Dead ball!" instead?