[Unfortunately, Dragonese is a skill only possessed by the bookverse Hiccup. Still, it's pretty easy to guess what the first mime means, given who he's now positive is this pokemon's trainer. Carmen. Good.
But then bad, bad, bad, because that is indeed the saddest Charmeleon face ever and Hiccup immediately worries if he's somehow done something to upset Miles. Honestly, it wouldn't have surprised him. Maybe Miles was upset from being away from Carmen? No, Hiccup had already offered to take him back... Maybe he was just overthinking this.]
action;
But then bad, bad, bad, because that is indeed the saddest Charmeleon face ever and Hiccup immediately worries if he's somehow done something to upset Miles. Honestly, it wouldn't have surprised him. Maybe Miles was upset from being away from Carmen? No, Hiccup had already offered to take him back... Maybe he was just overthinking this.]
Are you...telling me that Carmen's sad?
[He sounds pretty uncertain.]