In NSA, the were two different chapters on the downswing portion im working on. Im confused about which movement I should focus on. Brian mentions of "rock 'em sock'em robots" to pull the club through, wich is basically left shoulder up and back, i get it. But then later he mentions that the left shoulder should stop about half way down to let the arms swing past your body. I was curious if they accomplish the same thing or are they in fact different feeling and which should be applied and when. Great site by the way.