Jack noticed very early that men in good clothes died faster. Watching Jack Ketch shrewdly, he soon saw why: when Jack Ketch was getting ready to turn a well-dressed man off, he would arrange the noose-knot behind the client's left ear, and leave some slack in the rope, so that he'd fall, and gather speed, for a moment before being brought up short with an audible crack. Whereas men in ragged clothing were given a noose that was loose around the neck (at first, anyway) and very little room to fall.