While being swept down the river, Natsume managed to feel the presences of Hudzuki-gami.  Natori must make the choice to follow Natsume instincts or seal Fudzuki-gami.
I imagine he was trying 
to test his own power.
Tal vez intentaba probar su capacidad.
Tal vez sólo intentaba poner a prueba sus habilidades.
Possivelmente só queria testar seu próprio poder.