Foul followed by PC Foul

[Junker]

The difference I'm reading is in your original situation, A1 is committing the foul, not being fouled. In most scenarios like this, I would not call the B foul afterward, because the ball is dead on the whistle. In your later posts, you are talking about A1 being fouled, in which case the official has to see if the shot drops (although not after more dribbles and steps ala NBA continuation). As a player I'd be VERY careful about "stopping the play any way I can". Some officials (me included) could look at that as flagrant as the whistle had been blown and the play is dead even as the ball is live (this may not be by the letter from the rule or casebook, but I don't have it with me so I'm going on my experience).