Video prompt: A mountain biker navigates rocky terrain with thrilling agility.
Defect: Deformation (any reason involved with a movement)
Explanation: As the person rides the bicycle, the wheels of the bicycle undergo visible deformation, appearing bent or misshapen in certain frames. The movement causes the tires to lose their usual circular shape, exhibiting irregular distortions. Additionally, the wheels become blurred, making it difficult to distinguish the details of the spokes and the rubber surface, further contributing to an unnatural and unrealistic appearance.