The story proceeds to an interpretation of a poem written by Kukai and is collected in "Fuga Collection of Poetry (Waka)," 'If travelers forget that the stream of the Tamagawa River is poisoned, would they take water from it in far-away Koya?'
話は、『風雅和歌集』にある空海の「わすれても汲やしつらん旅人の高野の奥の玉川の水」という歌の解釈に移っていった。