Video prompt: A horse is galloping across an open field, its mane flowing in the wind. Mountains loom in the distance under a clear sky.
Defect: Deformation (any reason involved with a movement)
Explanation: As the horse runs, its front legs do not alternate in a natural back-and-forth motion. Additionally, one of the front legs splits into an extra leg, creating an anatomically impossible appearance, and all four legs undergo shape distortion, changing form in an unrealistic way.