Using Jedi skill, Obi-Wan Kenobi imitated perfectly the mournful howl of the dangerous krayt dragon to scare Tusken Raiders away from Luke Skywalker.
If Obi-Wan is defending a battle alone at a site, add 1 to power and add one battle destiny. OR If any other Rebel with ability > 2 is defending a battle alone at a site, add one battle destiny.