[He can sense that this actually means something to her. Multiple people advocated for her to him during his time here... clearly they, too, saw potential for more than just an evil witch in her. For a moment he turns sombre, if only to try and stand in for them a little, for Darin and Maribelle and the others who believed in Caster.]

You Heroic Spirits may not get to rewrite your past history, but through your actions after being summoned you get to change how you'll be remembered, don't you? This isn't one of your Grail Wars, but it serves the same purpose in that sense.

[She can become a heroine to those who spend these desperate months under the calamity with her, if only she chooses to be one.]