So the whole Mewtwo debacle? Thorin walked out of there vaguely impressed because if it hadn't been for Domri they might not have made it through that. He's also dead certain that if someone doesn't look after this kid, he's gonna just get himself killed one day because he has more heart than sense.
... not that he's about to jump on this task, but. Maybe we can still do something? Either way, Domri definitely left an impression.