[Mike O]

Lots of different comments in the golf field regarding Rory's "reverse" hip motion after impact - like the motion that shows up after the 18 second mark of the youtube link below:

Although it is more pronounced in his swing (driver) than most other players - they all have the same thing going on - it's an Impact Force Wave - that flows through the body. Only now becoming visible due to the higher camera speeds used today.

Different degrees of visibility based on the player, club being used, etc.