The fox squeaks in panic and forms a globe of water around himself using Create Water that shields him from the worst of the Incinerate, reducing it to a flash of steam that while hot, is far preferable to being burned to a crisp. The fox then attempts to sunder the barrier with a swipe of his claws, the natural enchantment on his claws giving a significant enough bonus that he at least stands a chance, depending on if the barrier is made out of proper magical energy.