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					Originally Posted by WestCoaster    A run ending in the end zone followed by a loose ball. | 
	
 Which means this is not a running play, it is a loose ball play. A fumble behind the LOS will result in all preceding action being a part of the loose ball play.
Same as if a QB runs behind the LOS and then throws a forward pass, all action before the pass is a part of the same loose ball play.
Let's take a look at Rule 2:
2-33-1
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		| ART. 1 . . . A loose-ball play is action during: 
 a. A free kick or scrimmage kick other than post-scrimmage kick fouls.
 
 b. A legal forward pass.
 
 c. A backward pass (including the snap), an illegal kick or fumble made by A from in or behind the neutral zone prior to a change of team possession.
 
 d. The run or runs which precedes such legal or illegal kick, legal forward pass, backward pass or fumble.
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 Since you have a loose ball play, the basic spot is the previous spot.