Greg grabbed Draco and started dragging him along, and Vince outstripped all of them, now looking terrified; Weasley, Potter, and Moon pelted along in his wake, and the fire pursued them. It was not normal fire; Vince had used fiendfyre, for which there was no countercurse. As they turned a corner the flames chased them as though they were alive, sentient, intent upon killing them. Now the fire was mutating, forming a gigantic pack of fiery beasts: Flaming serpents, chimaeras, and dragons rose and fell and rose again, and the detritus of centuries on which they were feeding was thrown up into the air into their fanged mouths, tossed high on clawed feet, before being consumed by the inferno.