Jransom,
Anytime a ball is dead in A's possesion, in advance of the line to gain, after all live ball fouls have been considered, it is a first down. When you march of the 15 yards against B you are in advance of the LTG and therefore A has a first down. Now you march the 15 off against A reset the chains and it is 1st and 10 for A at the spot we started from..
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