Susan has been mentally preparing for this conversation ever since the feast, running through potential avenues it might go, sorting through how to present the topic as best she can. That, plus her lingering sleepiness, ease her way as she retrieves a cutting board and knife and says, "Narnia was another world. My siblings and I stumbled across it through a wardrobe. It was... in dire straits. Beset by an evil witch-queen for a hundred years who made it always winter, never Christmas, and who turned all dissenters to stone." She starts chopping the walnuts, smooth and steady but slow, slow. "We worked with the Narnians and Aslan to defeat her and then ruled there for fifteen years."