I have seen Lefty a bunch of times now and my understanding is exactly as he states. His casting style involves a long slow move foward just faster than the line is travelling to load the rod with a short speed up and stop at the end or in other words a quick burst of acceleration with a positive stop at the end. I liken it to a Bruce Lee punch. His contention is that the shorter the distance between the beginning and end of this power stroke the smaller and more aerodynamic your loop will be and hence travel further. Some of his exceptions to this rule are weigthed flies and sinking lines when you must open your loop to avoid tailing loops etc... Hope this is more clear and I will be happy to bring his advanced casting book to the clave so you can get it first hand.