I agree that you got the call right, but the foul by B1 DID NOT cause the ball to become dead if, prior to the foul occuring, A1 had picked up his dribble and begun his throwing motion in shooting the layup. This is the "continuous motion" rule (4-11-1 and 2; and 6-7 Exception 3), and even though the foul was not against the shooter, the shooter is allowed to continue customary movement in shooting for a goal.
If the shot had gone into the basket, you should have counted the score, and then given the ball to Team A out of bounds because of the common foul by Team B committed before the bonus is in effect.
"Continuous motion" is in effect even if the shooter is not the one who gets fouled. The trigger is that "there is a foul by the defense during the interval which begins when the habitual throwing movement starts a try or with the touching on a tap and ends when the ball is clearly in flight." The foul by the defense can be against any offensive player.
This is not a shooting foul, since the defender did not foul a player in the act of shooting. Therefore, you could not award 2 shots to the shooter. As Todd noted, "bummer for the shooter."
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