Video prompt: A surfer is riding a large wave in the ocean, with water spraying around them as they balance on their board.
Defect: Deformation (when Object is involved in an act,  anything in this process that's weird. e.g. people walk into a wall. "Walk" is an act)
Explanation:  The torso of the person surfing undergoes changes in thickness and length, creating an unrealistic effect, as the body should maintain consistent proportions.