[Adam]

This is going to depend.

If A1's shot wasn't released prior to A2's foul, then the basket will not count even if made. A1 will shoot two free throws (or three if it was behind the arc), B will then get the ball at the spot nearest the foul by A2.

If A1's shot was released prior to the foul, then the basket will count if made and free throws for A1 will be determined accordingly and B will get the ball OOB at the spot nearest the foul by A2: unless….

If A1's try actually ended (such as not really getting the shot off) prior to A2's foul, in which case A2's foul should be ignored as dead-ball contact.