Well now Byleth looks downright joyful. If you asked any of his students they'd tell you its' a momentous event! It's rare for him to crack a wide smile much less a grin like he has right now.

"Yes! Oh this is just- oh wow, my heart is like. Going! All crazy. But it feels nice." Shiro gets a tight hug, and a moment later, Byleth perks up again, looking to the sky.

"Ah-! Look at that... it's starting."