Lew, I would agree, except "force is applied to that return path just after the Kb's float". There is no float with a shadow swing, in my understanding. You actively stop the ascent before the float and throw the bell back down. I could not find this distinction in the S&S book, but Al describes in the article linked above. The cadence of the swing will be much faster. You can actually develop more power on the upswing this way, in addition to getting the benefit of the arrest of the ascent, throwing it back down, and loading the spring at the bottom even better. Think of throwing a baseball back and forth between your left and right hands... you can toss it gently, then throw a little harder, begin to throw it with more and more force... there is really no limit to how hard and fast you can go, as long as the hand can throw, and the other can catch.