FiveFrameSwing, the above clip showing the drop and rise side-by-side is the perfect example of what throws off the batters. Each requires a different swing plane and hitters only have one swing plane: the hitter is swinging upward as the ball comes in downward. Same with MLB, one swing plane (adjustable). When a hitter stands straight up to hit they either have a level swing plane or they drop their hands or shoulders in an attempt to get on the plane of the ball. Rick Pauley's swing plane video shows the proper technique for developing a swing plane that can deal with the drop but their is no drill for the rise, the only choice is to intercept it at a specific place and point in time.