Crossing the Dark Lord

Crossing the Dark Lord is a short story written by Grant S. Boucher, originally published in Galaxy Guide 1: A New Hope.

Plot
In a story based on the accounts of a number of Imperial officers that defected to the Rebel Alliance, as told to Voren Na'al, a Star Destroyer captain uses security cameras to watch Darth Vader while he is meditating. After he hears Vader vowing to track down the Death Star infiltrators, the captain mocks him out loud. Vader then looks into the camera, reveals that he heard the captain's joke, and then strangles him through the Force.