Mike, I think you are getting hung up on the "is downed there" portion of the statements. If the covering officials that the players forward progress is stopped. The ball is dead, the down is ended and A is awarded a touchdown. This is not a special case because the goal line or end zone is involved.
4-2-2(a) says that the ball is dead and the down is ended when a runner is held so his forward progress is stopped. If A1's momentum was carrying him out of the end zone then the catch is completed when he contacts the ground inbounds and forward progress begins at that point. If A1 is not moving or is moving towards team B's end line an is then contacted as he is making the catch, forward progress is where he gains control of the ball before subsequently touching the ground.
In short, the player "is downed" when the covering official rules that a catch was made and the forward progress spot is in the end zone. As soon as that happens, the ball is dead, even if the player gets away and runs back to the B40 yard line.
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