It's not always possible to take out a victim with one blow. When
at first you don't succeed, stalk them! This skill is used to help an
assassin "hunt" his or her prey and keep on their trail even if they
start to run. This is a skill reserved for assassins, as they are the
only ones who are allowed to hunt other beings. While it may be
possible for non-assassins to train stalking for gold, the skill will
prove useless for them.