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					Originally Posted by johnnyg08    If a fielder; he reaches the position usually occupied by the fielder has has replaced, and play commences | 
	
 According to one of Luciano's books, this part was added the year after (I think it was) Billy Martin protested a game. It was when the DH rule had just come in and the opponent's DH went out to catch the pitcher's warm-up throws while the regular catcher was getting his gear on. Billy wanted the DH to be officially in the game at that point.