It goes back to what Yoda often says, that the hands tend to go down to Impact the same way that they go up to the Top. In the backstroke, a Hitter slowly swivels from the takeaway to the Top; he goes back down the same way--a long, slow swivel from the Top to Impact. In contrast, a Swinger completes his backstroke swivel early in the backstroke, and in the downstoke, he quickly swivels from Release Point to Impact.