"Oh boy," muttered Cass in a joyless tone, having gone back to looking at the wall and mentally going through the prime numbers. "I'm sure he had a whole lot of awesome things to say about his fuckup son. Why the hell are you here, anyway, huh? Want to tell me how much of a fucking asshole I am some more? I get it, okay? Just leave me alone." He burrowed into his coat a little and closed his eyes.