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				Originally posted by HighSchoolWhiteHat  
we'll have 1st and 10 from the 9 yard line when all is  said and done. 
 
 
first we have a face mask against the defense in the end zone. runner fumbles from the end zone and ball goes out of bounds at the 3 yard line. 
 
so I have 15 yards face mask from the end of the run which with the fumble is the 3 yard line. 
1st and 10 from the 18 yard line. 
 
but wait  we have a personal foul on A1.(dead ball) 
 
so Im marking off half the distant to the goal for this penalty and now we have 1st and 10 at the 9 yard line. 
 
now if  we have a 5 yard face mask... 
 
we have the fumble at the 3 yard line.  5 yard penalty to the 8yard line. NO FIRST DOWN.  then dead ball on A1's personal foul. so we have 3rd and 10 from the 4 yard line. 
 
 
with a 15 yard face mask  we have 1st and 10 from the 8 yard line 
 
 
with a 5 yard face mask we have 3rd and 10 from the 4 yard line 
			
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 I disagree that the 3 yard line is the end of the run (for penalty enforcement purposes).  The end of the run is where the runner lost possession of the ball (NF 10-3-3b).  Language in the case-book (10.5.2B) seems to back this up as well.  1/10 @ 15.
Obviously the U.C. would then be enforced after the first foul is enforced.  The chains would then be set.  1/10 @ 7.5
Just my two cents.