Now you can understand why Gandalf, listening to their growling and yelping, began to be dreadfully afraid, wizard though he was, and to feel that they were in a very bad place, and had not yet escaped at all. All the same he was not going to let them have it all their own way, though he could not do very much stuck up in a tall tree with wolves all round on the ground below. He gathered the huge pinecones from the branches of his tree. Then he set one alight with bright blue fire, and threw it whizzing down among the circle of the wolves. It struck one on the back, and immediately his shaggy coat caught fire, and he was leaping to and fro yelping horribly. Then another came and another, one in blue flames, one in red, another in green. They burst on the ground in the middle of the circle and went off in coloured sparks and smoke. A specially large one hit the chief wolf on the nose, and he leaped in the air ten feet, and then rushed round and round the circle biting and snapping even at the other wolves in his anger and fright.
The dwarves and Bilbo shouted and cheered. The rage of the wolves was terrible to see, and the commotion they made filled all the forest. Wolves are afraid of fire at all times, but this was a most horrible and uncanny fire. If a spark got in their coats it stuck and burned into them, and unless they rolled over quick they were soon all in flames. Very soon all about the glade wolves were rolling over and over to put out the sparks on their backs, while those that were burning were running about howling and setting others alight, till their own friends chased them away and they fled off down the slopes crying and yammering and looking for water.“Out of the Frying-Pan into the Fire” - The Hobbit - J.R.R. Tolkien
