Many players, like Chela and Petrova, open their torsos and shoulders completely to the net as the butt cap of the racket points at the ball. This creates a stretch and pull of the double bend, which lags behind. The opening torso is, in a sense, pulling the double bend forward - and the butt cap of the racket is leading the way.

There is really a "double" pull occuring here. The torso opens and pulls the double bend and the double bend, with the butt cap of the racket leading the way - is pulling the racket.

By having the larger torso open and pull the double bend, which pulls the racket, the player creates a stretch/pull dynamic Energy is being transferred from the core of the body outward, with one segment leading the next.