Arthur went on grinning, still pleased to have a positive, something good to focus on. It seemed really, he had a lot of that to owe to this world.
“I'm certain it will be.” Arthur assures with a nod, that it will be a form of defence for someone so willing to learn. “Should the need arise.” There a small snort to follow as if he's not at all amused. “Currently all this world seems to threaten us with, is afflictions we cannot defend ourselves against. Magic.” Arthur is unnerved by such. Types of magic that changed personalities, behaviour and worse.
“Not at all.” He dismissed the words easily. “You're learning, and you're willing to learn.” Arthur is not unable to recognise when someone may take time or effort to be gain skill. “Besides, I highly doubt anyone's going to test my patience more than Merlin.” Arthur added with a vague look of annoyance. Merlin likely would say the opposite. "Perhaps you can better educate me of modern customs." He was only half-joking