There is a great analogue to this concept in American football. An offensive lineman’s job is to protect the quarterback from onrushing defensive linemen. If the offensive lineman attempts to do this by holding his ground, the defensive lineman will easily run around him and crush the quarterback. As a result, offensive linemen are taught to lose the battle slowly or to give ground grudgingly. They are taught to back up and allow the defensive lineman to advance, but just a little at a time.
