Cut off from Grand Moff Tarkin’s leash, Vader is free to terrorize the crew of his fleet, starting with the hapless Admiral Ozzel. After his blunder in alerting the Rebels to his presence, thus giving them the time to put a shield and force the Empire to embarking on a costly ground assault, Vader decides to take matters into his own hands, relieving Ozzel of his post via long-distance Force choke and simultaneously using the opportunity to promote Captain Piett to the rank of Admiral.
“For my ally is the Force, and a powerful ally it is. Life creates it, makes it grow. Its energy surrounds us and binds us. Luminous beings are we, not this crude matter. You must feel the Force around you.“