When you are in the Cantina or anywhere else in the game and you are Darth Sidious,Count Dooku or when are your customized sith character when you have beat the game or Darth Vader. You can use Force Choke or Force Lightning. When you are one of those characters and you see another character with a red glow around them press B to use one of the force powers, but don't hold it for too long. Steer the Left Anolog Stick forward and they will fly almost all the way across the room!