This is a portal.

Three figures walk across a dark, open landscape under a stormy sky, their silhouettes moving from left to right across the frame. The scene cuts to a close-up of a man's face in profile, then to two figures standing together, before abruptly shifting to a white toilet standing alone in the dark, with a person's legs visible beneath it. The sequence ends with a close-up of a man's face in profile, looking off-screen.