[Hiccup is unaware of Thor's struggle to stop the rain, only that the man seems fixated on it. A casual shrug.]

People say that whenever it rains, Thor rides across the sky in his chariot. That the lightning comes when he slays giants with his hammer.

[A faint smile as he's totally unaware that he's talking to the god himself.]

But that's just what we say. Who knows what they're really doing.