Video prompt: Lava flows steadily down the slopes of a volcano, its molten surface rolling sluggishly over the rocky terrain, forming glowing rivulets and sizzling on contact with cooler earth.
Defect: Deformation (any reason involved with a movement)
Explanation: The lava initially appears normal but suddenly collapses as it flows, with its texture shifting in an unnatural way. Both the lava and surrounding rock begin to behave like a liquid, melting together until they form a single, unrealistic pool of molten rock.