"The roof?" After a moment of thought his eyes light up in delight. "Yes! The roof! I mean...I don't know how to get there, but please, let me help you find it. If I can get to the roof I can watch the Master's land again!" He's practically giddy with excitement. "All right, let me think. We're probably in the best place to look for it, come to think of it." He gestures to the staircases all around them. "If we keep climbing we'll get there eventually." Logic!