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Create a polished 15-second cinematic 3D animated short with continuous storytelling and no dialogue. Beat one (0–3s): wide low tracking shot of a streamlined passenger train crossing a snowy mountain valley at blue hour, camera beside the wheels as powder sparks, cold sidelight rakes the cars, wind rushes past the glass. Beat two (3–6s): camera tilts up to the ridge where a fracture opens and an avalanche breaks, a white wall gathering speed toward the track, deep rumble sitting under the wind. Beat three (6–10s): a large original dragon with dark teal scales and swept horns lands beside the moving train in an explosion of snow, wings spread wide as a living shield; camera pushes in at rail height as the blast strikes the wings and sheets over the roof; one low orchestral hit marks the impact. Beat four (10–12s): the snow thins, the dragon folds a wing and turns toward a carriage window, breath misting in the cold. Beat five (12–15s): an adult passenger presses a gloved palm to the glass as the dragon's amber eye softens; hold a quiet matched two-shot through the window while flakes settle and the wind falls to a hush. Direct native audio: rising wind and wheel clatter, a sub-heavy avalanche roar, wing impact with muffled percussion, then soft snowfall hush. No dialogue, no brand marks, no watermark, no existing film franchise, stable dragon anatomy and train proportions, no child subjects. User request: A passenger train crosses a snowy valley while an avalanche breaks; a large dragon lands beside the cars to shield them, then shares a quiet look with one adult passenger.