[Her eyes follow him, some kind of knot in her stomach.]

... she is.

[It's quiet. And Rei falls silent again, as she thinks, before she closes her eyes, her hands folded underneath her chin as she lets out a long breath.]

Fire is unpredictable and can't be controlled unless you're just as unpredictable as it is. It can get away from you if you get overconfident.

[Rei opens her eyes slightly to look at him again.]

I swore that I wouldn't tell anyone about the mission, just like I swore to tell no one else your name. I couldn't break my word. And I'm sorry. [And Rei sounds genuinely guilty, as she watches him.] I never meant to hurt anyone and I was a hypocrite and I won't do that to you again.

[There's only the tiniest pause before Rei closes her eyes again.]

I can't let you summon this thing by yourself.