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					Originally Posted by  dsqrddgd909
					 
				 
				I understand that.  My question is why mirror at all in 3-person but not in 2-person?  Does the trail block the clock operator from seeing the lead? 
			
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 He answered your question.  The Trail and Lead are on the same side of the court.  In 2-man mechanics, the Trail would have a hard time seeing when the ball is touched in the corner right in front of the Lead.  Not so in 3-man.