[She kind of reminds him of Morgana when she was that age and that makes him horribly depressed given where they are now and perhaps a little homesick because he greatly missed that Morgana.

Arthur's forced to take a couple steps back to avoid the end of her sword, and she gets an impressed look for that. But when he swings his sword again, it's with the specific intent of knocking it out of her hands. He saw how you almost dropped it earlier.]