[Responds with only a quiet "all right," not much else for him to do (as always) but stay there. He'll wait.]
[And when Fuuma wanders back there, he might find more than just the stream, but also old structures and things the hunters of Kamui's time left behind in this place. Notes, probably, about the creature they had been charged with keeping watch over until they stopped bothering and just sealed the cave, thinking that on its own would last.]