Jo burst into the room and stopped. Mary was in the corner with someone who was holding onto her protectively. She blinked in surprise. For just a moment, she was sure it was Sam there. It was only after a closer look that she realized that it was the guy she'd met at the diner. Rob. What was he doing here?
It didn't matter though because Mary was bleeding and in rough shape. It was only then that she looked past Mary and Rob to see Johnny's body on the floor and a woman advancing on Mary and Rob. She hesitated, confused as to who the woman was. It was only once the woman pulled out a gun and shot in her direction that Jo conected the dots. She ducked out of the way and kept moving, hoping to draw the fire away from her daughter.
She mentally kicked herself for just assuming that the killer had to be a man. The moment of hesitation might cost her. She just hoped that Dean and Cas were right behind her.