Read the excerpt from "Prometheus":
Prometheus was not satisfied. All that night he lay awake making plans. Then he left his couch at dawn, and standing tiptoe on Olympus, stretched his arm to the eastern horizon where the first faint flames of the sun were flickering. In his hand he held a reed filled with a dry fiber; he thrust it into the sunrise until a spark smoldered. Then he put the reed in his tunic and came down from the mountain.
What does the word "smoldered" mean as it is used here? (V.1.3)