Video prompt: A lioness stalking prey through tall grass in the African wilderness, her muscles tensed and eyes focused.
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 muscle structure of the animal, particularly along its back, changes size inconsistently, with muscles appearing large in some frames and small in others, creating an unrealistic and unstable appearance.