[Oh, Naoki murmurs, under his breath, before shaking his head as though clearing something away. His smile is troubled (worried) but Weiss might not recognise that in him.]

Hey, think about it a little more. Even if it sounds unbelievable.

It's not even a funny story, y'know? If I wanted to tease someone, I'd go with something better than "world was destroyed". Something with an actual punchline.