This is a very important series of pictures. If any type of movement occurs at this point, other than what is pictured, your golf swing loses power and consistency in directional flight.
If you closely inspect the pictures above, you can see that the from left to right, in the second picture, the club has not changed positions but the lower body has moved into the white leg line. In the third picture, below, the butt of the club has clearly dropped as the lower body has moved past the white leg line. The key to the “transition” is that the lower body starts the downswing.
Remember, when practicing this specific move that you must complete the backswing before an effective “transition” can occur.
Practice slowly and deliberately. Next step, “lagging” the club to delivery.
Keith Haley Golf 