I'll take a stab at it.
The image is a bit crude but...
If your fingers are coming straight up the back of the ball like the Blue line. The ball will basically go dead straight.
If your fingers are following the the Red line. Your coming around the ball, your hand isn't particularly staying behind the ball and it's like your trying to spin it (the ring finger is more or less following the middle finger) to make it hook.
The green line is more like what you want, The hand is behind the ball with it rolling forward off your fingers, with the ball turning your hand not your hand turning the ball.
in this video they talk about "rotating through" vs "rotating around"
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