There is no special rules for a try down in NCAA accept for penalty enforcement differences and that the 4th down fumble rule is in effect. However, since B recovered the ball, then fumbled it, any A player can recover the loose ball and advance it. If the team A player advances it to B's GL, it will be a 2 pt conversion. I cannot really give you a rule reference cuz as I stated above, it is like a regular down, with those exceptions.
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