The river person appears a few seconds after you ring the bell.
River Person: OOOOOOOOHHHHHHOOOOOHHHOOOOOHOHO
River Person: I haven't been beckoned for 6 whole years
River Person: it has been so lonely
Syb: Oh, that's so sad.
Syb: Well, you're here now, how've you been?
River Person: I've been horrible
River Person: bugs and mice are my only clientele
River Person: they aren't good listeners to my riddles
Syb: Well, if there's anything I can do that ca-
River Person: Please ride my boat
River Person: I can take you anywhere in the underground, no charge
Syb: Well, I don't know.
Syb: Give me a second to think it over.