Slapping the backboard by shooter's teammate

[JeffTheRef]

Under Fed rules . . .

A1 is laying the ball in when:

(a) before the ball hits anything, and it subsequently goes through;
(b) while the ball is in the basket, and it continues and goes through;
(c) after the ball is through the basket (cleared the net)

A2 slaps the backboard hard enough to merit a T for unsportsmanlike conduct.

What's the status of the bucket in each case? Nothing cancels the shot once it's left the shooter's hand, right?

For completeness, if, however, a T is assessed (on either team) while A(n) is in the act of shooting . . . sorry, I know this was discussed recently . . . I am weak . . .