Let your wonder cease. It's done for effect. In a way it's a lot like putting English on a cue ball.
It's really the same principle as rolling your wrists for a slight draw. In this case, exaggerated to a large degree. I've pulled off something similar a few times in my life but it's always been when I came up short on making the turn on a 90° dog leg. And I don't get that kind of distance (but then again that's normally setting up the next shot.)
On the other hand, Phil does something similar and he's just using a closed face with a slight wrist turn. Still, a hell of a shot here as well.