He's a guy who has seen so much, done SO MUCH... that he's calm. He's so far beyond wrath at the demons that he's entered a weird Calm and just LIVES there. Nothing shakes him of it. He doesn't grunt, he doesn't yell, he doesn't scream, he just breathes and moves on. New demon? Well, it'll bleed like the last. He doesn't revel in combat, he just moves through it like walking through air; it's a function of existence for him.