Happy in his own little world, Nightwing swims around near the bottom of the stream and gathers several small, flat pebbles. He also discovers, much to his delight, that if he flaps his wings he goes a lot faster, and spends a short time shooting back and forth up and down the stream. Eventually, he surfaces again, swimming to the edge near Hunter, still clutching about five of his pebbles. He climbs onto the edge and piles them by Hunter's paw, then takes one in his paw and holds it flat. "Have you ever tried skimming stones?" he asks, throwing his pebble and watching with glee as it bounces twice before sinking.