A comet is a celestial body that appears suddenly in the sky and is gone just as quickly, so saying the streak of pain was gone like a comet means it disappeared quickly and not stayed permanently
Context: "The boy's face changed swiftly, showing a hint of pain before it stayed there permanently"
Hypothesis: He saw the change in the boy's face: a streak of pain, there and gone like a comet.
Based on the context, is the hypothesis true, false, or unknown?