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			From the FED rule book Section 22, Art.1 "Obstruction is an act (intentional or otherwise, as well as physical or verbal) by a fielder, any member of the defensive team or its team personnel that hinders a runner or changes a pattern of play..." 
 
From the FED case book 2.22.1 SITUATION A: "R1 attempts to steal second.  F2, upon receiving the pitch, throws a pop-up to F6.  F5 yells "get back, get back".  R1 thinks B2 has hit a pop-up and starts back to first where he is tagged out .  RULING: This is verbal obstruction and R1 shall be awarded second base."
		 
		
		
		
		
		
		
		
		
	
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