Video prompt: A horse galloping across a wide open field, mane flowing in the wind as it runs at full speed.
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 hind legs of the horse don't appear natural, as they seem to lag behind the rest of the body and move inconsistently with the horse's overall motion.