That's cuz it's one of those plays (read: every play) which draws from several different rules at once. They can be rather intricate at times.

This play has a pretty easy answer: after the release of the shot there is no team control. Thus, if an offensive foul happens after the release then you penalize the foul and count the bucket if applicable. If it's a defensive foul then penalize the foul and count the bucket if the offensive player had begun the shooting motion. The shooter gets continuation during a defensive foul. Make sense?