Nobunaga was dying to talk guns. He was about to head back the stairs when he sees someone (well, no first, he thinks he's hallucinating guns floating up to him, THEN he sees the person!) trying to climb the cliffs without rock climbing tools or... using the stairs. So this, he has to watch.

He feels like he should get that caramel popcorn treat everyone talked about that goes with movies.

There's a gentle applause as she reaches the top and doesn't even seem out of breath. But then an arrogant cocky smile. "You know there's a flight of stairs over there," he pointed in their direction. "Or do you just like scaling sheer vertical walls for practice?"