[It doesn't escape Art's notice just how much is driving his anger, and that's what makes this all the more difficult, what makes him flinch again though soon even the nauseous look is replaced by a better attempt at composure, not quite cold but close to it. He thinks it's a better attempt, anyway -- Art never realizes just how little he's actually able to detach himself emotionally in an argument, but for now he has that closed off look down. Even as much as he wants to look away, he meets that blazing look squarely.
Even then, there's sincerity to it as well when he starts, somehow both apologetic and stubborn.] It wasn't to do it for nothing.
I could tell... and perhaps that was this world's doing as well [though he's very much suspecting not, or that at least none of this is a coincidence at all] that I could just know.