The NF describes forward progress as, "the end of advancement", NF:2.15.2 advises, " When an airborne player makes a catch, forward progress is the farthest point of advancementafter he possesses the ball if contacted by a defender.
It sounds like, in your example, A1 completed a catch at the at the A32 and moved it back to the A29, on his own, where he was contected by B22, who knocked him back to the A25. I would consider his forward progress spotat the A29 and it doesn't matter whether B22 maintained contact all the way to the ground.
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