Cor swears that he could hear Cid chuckling in amusing agreement, and it makes him grimace at the reminder of always being told to 'relax' and 'take a vacation' all those years. The only time he really went on 'vacation' was when he took on hunts that even the best Hunters had trouble with.

That, and he's just too damn lucky to let something like a mere cold keep him from fulfilling his duties.

Still, the veil of annoyance, doesn't last very long - no more than a minute or two - and he finds himself sighing in defeat. "...I suppose you're right, both of you." He then looks at Gladio again. "You still haven't explained how the hell did you get back here so soon, though."