[Raymond]

Referee the defense. If you referee the defense instead of staring at the ball you will see:

-- if the defender remains vertical and legal
-- if the defender walks into the offensive player
-- if the defender moves his arms forward and creates illegal contact
-- if the defender raises his arms late and illegally contacts the shooter while raising his arms
-- if the defender moves his arms forward creating illegal contact then returns his arms to vertical to give the illusion he was legal the entire time
-- if the offensive player creates contact that causes the defender's arms to collapse

This is all possible by refereeing the defense.