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				Originally posted by andy1033  
1 is enforced from 25 as it was running play so enforced from end of run. 
			
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 The easy way to think of this is:
If you step off from the 30, you're giving the offense five yards they haven't earned.
The rulebook way is:
The end of the run is the basic spot.  It's not an all-but-one exception, so mark the penalty from the basic spot.