"... I see." Like any other ancient language he supposes. More archaic grammar. Vocabulary. Perhaps even a differing alphabet. "I doubt it, then, if it's a language specific to your world. The books here are all in -- whatever the native languages are here."

He's self-aware enough to have realized he's not speaking the language he grew up with by now (though it was more reading that tipped him off than anything else and the moogle had confirmed it).