There were a lot of things Dean was prepared to deal with, but Cas barging into his room and shouting in his face wasn't one of them. Not while he had other shit on his plate. His face fell into what felt more and more these days like his default expression. One of anger.
"What the hell are you talking about? You know what? I don't care," he waved a hand dismissively. Whatever Cas was on about wasn't as important as figuring out what had happened to him, and for that he either needed his brother or an angel at full power, and Cas was neither at the moment. "I gotta find Sam." Waiting around was taking too long. It was time to go track down his brother.