 CONT: Most of the times, when Luke or Ben ignite or deactivate a  lightsaber, the saber is not shown igniting or deactivating; just  the sound effect his heard. And the times when it IS shown, even  though it is supposed to be one shot, the character or his/her body  part is in a slightly different location after the weapon is ignited  than before the weapon is ignited, indicating two separate shots.