When the line can be pulled through the loop, the wind can push my BOW, so instead of only the stern swinging, the whole boat moves. After a few feet, the tension catches up and the bow stops, but now I'm out of phase with everyone else, and of course, it start all over again in the other direction. If your bow cleats are close to each other, or if you have a center cleat, or you can run the line through the anchor chock etc., this whole action is reduced, if not eliminated.