Push them using Force Push, then run up to them close enough that you touch them. Then, push them. Note: This will only work if they touch a wall. When you are fighting Stormtroopers or Swamptroopers, use Force Push, then throw your lightsaber at the fallen enemy. This almost always kills them instantly. To safely disarm Stormtroopers, use your Force Pull to pull their guns out of there hands. Whenever you face Stormtroopers near an edge, you can push them off.