Video prompt: He kneels down, placing a pair of sleek, black roller blades on the ground beside him. With a friendly smile, he gestures to a small group of onlookers, including a curious child and a couple of teenagers, who are eagerly watching. The man picks up one roller blade, showing its sturdy frame and secure straps. He carefully slides his foot into the boot, ensuring a snug fit, and expertly fastens the straps, demonstrating each step with precision. As he tightens the final strap, he stands up, balancing effortlessly on one foot, and gives a thumbs-up to his audience. The sun glints off the metal buckles as he glides forward a few feet, showcasing the smooth motion of the roller blades. The onlookers clap and cheer, inspired to try it themselves.
Defect: Deformation (any reason involved with a movement)