'You should rest. After all, that's why we're here' What does this mean?

I mean, it could have a double meaning, but they are at a resort, which is a place that people generally go to rest and relax.

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We hope that the dead RIP.

A bird sings and the mountain's silence deepens.

Maybe it's a hint to the viewer to stop trying to figure the film out and just let it wash over instead?