[Before long the forest opens up into a clearing, most of the space of which is taken up by a large pond, over which the blue jay flutters, chirping insistently. Not having wings, Hermes and Isabella are forced to stop at the water's edge. Beneath pond's surface are numerous bubbles, each containing a formless, softly glowing light. The sound of the flute is definitely coming from the pond, but it's impossible to tell exactly where.

At the edge of the pond nearby is a wooden sign and two simple fishing rods. Written on the sign is another sing-song verse.

Cast your line and make a wish
Though your reward will not be fish
What you seek doth lie within
So try your luck and let's begin

Hermes reads the sign and looks at the rods.]

It seems we're meant to use these to retrieve the flute, which I can only presume is in one of those bubbles. Though there's no ready means to distinguish which one.