[Thinking carefully and noticing things are two things that Cat Noir is not especially good at (Ladybug's the quick thinker of the two, after all - he's the guy who does the fighting while she figures out how to save the day), and so it takes until Goliath says that for him to notice the language thing. He's surprised at the revelation, and his tail flicks again as he looks back down at the Carnival, even more on guard at the realization - is it an akuma attack? How else could you explain sudden language changes?]
It must be some kind of villain... But why make people speak another language? That doesn't seem very evil. [Maybe someone who failed a language test or something? Or a translator who got fired. The fact that his logic wouldn't make sense to anyone else doesn't occur to him at the moment as he tries to puzzle this out, still scanning the carnival below for signs of an attack... Not that he knows very well what it's supposed to look like, only being here for part of a day himself.]
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It must be some kind of villain... But why make people speak another language? That doesn't seem very evil. [Maybe someone who failed a language test or something? Or a translator who got fired. The fact that his logic wouldn't make sense to anyone else doesn't occur to him at the moment as he tries to puzzle this out, still scanning the carnival below for signs of an attack... Not that he knows very well what it's supposed to look like, only being here for part of a day himself.]