Video prompt: A cocker spaniel eagerly retrieves sticks tossed into the backyard, bounding back with relentless enthusiasm.
Defect: Deformation (any reason involved with a movement)
Explanation: The **dog, initially facing away from the camera with its rear towards the lens**, suddenly twists unnaturally, with its head and rear switching positions. This movement is accompanied by a **severe and bizarre deformation** of its body, creating an unrealistic and unsettling transformation. Normally, such a movement would follow the natural joint and skeletal structure of the animal, without extreme distortion.