Sundance: At its best, Dawn Porter's documentary functions as an act of deep listening and a step — however incomplete — toward reckoning with the harm done to three Black boys who deserved far better. “ When a Witness Recants ” opens with a simple, deliberate movement: writer Ta-Nehisi Coates walks from deep in the background into the foreground, takes a seat, and prepares to speak. The shot lasts maybe fifteen seconds, but it quietly announces the film ’s governing logic. Coates sets the