The child laughs immediately when Luka says the Wizard's being very rude, even as they stay standing and waiting. They've presented what they want, now Luka just has to take them up on it.

Or leave.

"Just walk down the mountain!" The child answers immediately to Luka's question, somehow being even more unhelpful here. That's the way out, just walk down to the ocean. The ocean was out. Easy!

Looks like Luka's stuck between a Wizard and a hard place.