The myth goes like this:
A puffin-hawk meets a water spirit in the desert. Neither can escape alone: the spirit far from water, the bird far from his flock. So they merge their strengths to fly to safety. But her magic entwines him until she feels his heartbeat in her breast, and in the end, they cannot bear to part.
At least, that's how Aang thinks it goes. Like so many of his people's tales, this one exists only in his memory. He holds Katara tighter against him in the dark. This tale, at least, has been given new life.