The Ultimate Free Throw situation

[Adam]

Originally Posted by AKOFL

That was my thought. Points scored stand but fouls unless intentional or flagrant are nulified.

Close, the rule says the free throw and activity during it are nullified unless flagrant or intentional. A2's basket did not come during the free throw, it came after. That's why it didn't get nullified. Had A2 been fouled on the shot, this would have even been more fun.
You'd have A3 shoot his two.
A2 then gets his one free throw.
B gets to pick a shooter.
B gets the ball at the division line.