Not digging in the rules book here, but I believe since you had a PF, and not a USC, regular enforcement applies. If it's a foul on A, basic spot is the spot of the foul; if it's a foul on B, then follow succeeding spot enforcement on a scoring play (i.e. A can take the foul on the try or the K.O.). Had it been a USC, then you enforce from the succeeding spot. Look in rule 10 under "Basic Spot"; should say that USCs are always enforced from the succeeding spot.
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