Jazz Tangcay Artisans EditorBefore he was a director of spectacles like “Deadpool 2,” David Leitch did stunts for dozens of productions, often doubling for Brad Pitt in films including “Troy,” “Mr. & Mrs. Smith” and “Fight Club.” Leitch puts his stunt background to good use in the action film “Bullet Train,” in cinemas now, in which he reteams with Pitt, this time as director.Based on a Japanese novel, the action comedy revolves around five assassins from around the globe who find themselves on a fast-moving train.