Maybe it's me getting old, but whenever I see this move done, I think of Blackjack. He seemed pretty good at it.
So basically if you're a runner at first, as soon as the arm motion goes to third, take off for second? Seems to me this will reward teams with speed and aggressive base running. Sounds like a good fundamental to practice in spring training.
2015: hoping we traded a donkey for a stud at DH. If departure patterns hold true, playoffs are in the future. GO SOX!