Dean was having trouble with the Mark of Cain ever since he got it, it'd made him uncontrollable. He'd fought against the rising, brutal urges as long as possible but was beginning to lose the battle, and with it the last shreds of his humanity. "Go, I'm serious. Now!" Dean demanded gruffly and gave you a look. He didn't want to part ways with you but it'd be for the best, necessary to keep you safe, his tone softening to a halfhearted plea. "The mark's dangerous, goddamnit, ya can't just-.."