I probably would have ruled as you did, Mike. I think your logic is correct as per 10.3.3b...."Where the runner loses possession if his run is followed by a loose ball." It appears as though the book was following 10.5.2 which says "The enforcement spot for any foul by the defense is the goal line when the run ends in the end zone and would result in a safety." If the book was following the special enforcement in 10.5, then my guess is you're right and the book is wrong because the end of B's run would not result in a safety had the ball became dead there. It would have been a touchback if there had been no foul and subsequent fumble.
I'm interested to hear what others have to say. I see it as B's ball 1st and 10 on 15 as well.
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