[It's subtle, but he notices the release on his mind when the charm magic ends. That urge to leave returns, but now he understands why it was there to begin with- Diluc was making sure that he stayed put to finish healing. Inwardly, he's not sure how to feel about that, especially because of what the vampire has just said.]

You think so?

[He almost scoffs, to say something like that about him right to his face like that. Diluc acts like he knows him, which bothers him even more because...he just might, even if he doesn't fully understand or want to accept it.]

You made this suggestion during our battle. Do you really believe I'm him? A shadow of the past given life again? C'mon, even I don't believe that.

[He says it, but even Tartaglia isn't completely convinced of his own words.]