Generally speaking, it's where the straight line path of the hands ends and the circular path begins in the downswing. For a delayed release Swinger, it's the release point or the point where the Left Wrist cock unloads. In order to minimize the pulley size, the Right Hand stays close to the Right Shoulder on the downswing.
hmmm....so does that imply/necessitate a steeper path with small pulley?
Not steeper, because a large pulley, max delay wrist uncocking, snap release swing is as steep, but the shaft is not as close to the Right Shoulder. This is the action of T Woods of 1996.