"I'm fine." And it's true. Nathaniel loves being a Grey Warden, in peace and in war. "Glad to see you, too. Are you...are you all right, Anders?"

His tone takes on a tenderness, genuine concern and fondness. He knows Anders is not all right. But it gives him a chance to ask for help, support, or anything else he may need without worrying whether Nathaniel will give it or not.