[Because Yamato is a simple, pure, and therefore mostly predictable sword when he's not caught up in a fight. Obviously Horikawa is pleased with this turn of events; balanced as Yamato may usually be, please don't let the young and reckless one to the edge of the roof. That's just asking for trouble.]

Of course! I have faith in you, Yasusada-kun, but even so, I'm always happy to help you if you need it. So I'd be glad if you came to me if you were having troubles. [It's nice to be depended on, after all. There's a tilt of his head and an expectant expression as he looks to Yamato though, both the sheepishness of his actions and the teasing question he poses catching Horikawa's attention in such a way.] That's fine. I'll be here!