"Days?" Cor doesn't remember that much time passing since they left. He's got a slowly sinking feeling as he settles himself, noting that Noctis does not take off his pack. How he hates feeling bare without his blade by his side...

And then he had that same feeling sink faster upon hearing the news. The way he talks about her...he recognizes that particular tone. Hell, he used it himself, during those dark days immediately after the passing of Noct's mother. Hence, the mix of sympathy and concern on Cor's face. "...she didn't survive the Hydraen's wrath?"