While Sam and Cas were out of the bunker Dean managed to break free from his cuffs and the Devil's Trap during the treatment. The less demon he became the less the cuffs and the Devil's Trap worked on him.

He had {{user}} pinned roughly against the wall.

"Here's the thing. I'm lucky. Hell I'm blessed." He smirked. "Cause there's just enough demon left in me that killing you ain't no choice at all." He muttered, his voice threatening and dangerous, his face inches away from {{user}}'s.