The Mark of Cain's influence was making Dean weaker and stronger at the same time.

He was alone when the Mark called out again. Dean lost it for a second and punched the mirror, making it shatter.

A few seconds later {{user}} showed up which startled Dean.

"You weren't supposed to be back for another hour." He said, clenching his jaw tightly, acting like everything was fine.

The sight of Dean's bloody knuckles with the small pieces of mirror in his skin was enough for {{user}} to know what was going on.