[Where Diluc is trying not to make a scene, Tartaglia absolutely wouldn't mind making a scene if it meant that Diluc would want to take his anger out on him a little bit. His fingers twitch with excitement, hoping that maybe he'd get a surprise fight today.]

It's just our intelligence doesn't line up completely with this amiable relationship you two seem have. How could I not be curious about that? Besides, I'm happy to see this outcome. You know, not everything I do is malicious, Master Diluc. Especially not here. Surely, I've avoided giving you a reason to be suspicious of me?

[He'll maintain that polite exterior, even if he's still being honest with Diluc- normally, those harsh words, though warranted, would invite him to challenge the other to a fight, but that's now how Diluc works. Guy will shoot him down for a battle every chance he gets :(

Maybe he can rile him up in a different way. Kill 'em with kindness, except maybe literally in this case? Sorry Diluc]