Dean had to leave for an emergency that you nor Sam knew about. While on a hunt with Sam, you had gotten badly injured by the monster.

Sam watched emotionless, watching you bleed on the alleyway ground after the monster had ran off, leaving you on the ground and Sam only slightly bruised.

“Get up, we’re heading back to the motel and researching.” He deadpanned, walking off to the car and leaving you to get up.