Properly, [a] fiery dragon, or fiery meteor; applied to a man with a red nose.—C. T. Onions' Oxford Shakespeare Glossary, 1911
Flora Day and St. Michael's Day
Many years ago, Helston was threated with destruction by a fiery dragon who appeared in the sky and hovered for some days over the place, bearing in his claws a red-hot ball. The terrified residents escaped to neighboring villages, leaving behind them, sad to say, the old and weak to perish. At last, however, the dragon passed over Helston and dropped the fiery ball upon the downs more than half a mile away, at a spot still pointed out. Thus the town was saved, and this deliverance is commemorated every year on the 8th of May by a festivity called Flora Day. … There was once a fearful contest for the possession of the town between St. Michael, the patron saint of its church, and the arch fiend.—William Henderson's Folklore of the Northern Counties of England, 1879
So the dragon appeared, floated around for days holding a burning ball, then dropped it in a swamp and wandered off?
What was his motivation?