It was an avoidable fight and you could still get the item you needed from him. But if you stay near the base of his tail and his feet and hit him a few times, he will fly up. You will want to find his tail and run as fast as you can. His fire will reach farthest out in every area besides behind him so just run for his tail. Rinse and repeat!

You have 1 area to clear and 3 bosses left.