Video prompt: a group of children riding a bike down a dirt road while smiling and laughing, making it a cheerful and joyful scene.
Defect: Deformation (any reason involved with a movement)
Explanation: As the child rides the bicycle, both the bicycle and the child's body, especially the legs, undergo noticeable shape distortion and blurring. This creates an unclear, warped appearance, making the movement and form of the child and bicycle appear unnatural and indistinct.