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					Originally Posted by  movingthechains
					 
				 
				 
Headlinesman or Line Judge in 4 and 5 man mechanics has the line of scrimmage and determines wether the kick crosses the line of scrimmage.  
			
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That's why the L stays on the LOS until he is certain that the ball has crossed it.  This is a perfect example of why we do that (5-man).