Right?! Maybe Camelot is on a diplomatic mission to establish allies across the seeeaaaaa. And Arthur is still a bit skittish around magic, so he asks Zuko sort uncertainly, "Is firebending magic?" But firebending isn't, of course, not really. It's one of the most natural things there is.

(And maybe Merlin says, "Magic is not an unnatural thing," omg then maybe I get distracted using firebending to explain magic.)