[The mocking tone doesn't bother him. They're both distant people, just in different ways. Erhard doesn't do anything to restrain Natsuno from leaving, but there's a strange distance in his eyes, as if he's not seeing the teenager anymore. It's not a thousand yard stare, it's further than that.]
... because you feel you should be punished for your failings... for existing.
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... because you feel you should be punished for your failings... for existing.