[The bearded man doesn't mind, he's used to working with babbling children. At least Fai's babbling is coherent!]

Oh, good! I hope he's happy now.

[He laughs in response to the watermelon.]

Of course it works! That's why they're called watermelons! You turn green when the watermelon is about to run out, that's how you know to swim back to the surface.