It would be rude if he didn't finish it. Not that Matthias was some sort of arbiter of politeness.

"Mm, I can believe that." While he doesn't kill humans directly, he's been known to have an indirect hand in it. That's probably just what happens after he worms his way into their hearts and souls and then just... abandons them when he's bored.

"I like to think of myself as a storm. Awesome and beautiful and its power, but leaving only devastation in its wake. That's too romantic, though. She wasn't one of mine," he added nodding toward Death. "I think she was just tired of living."