You and Dean were trying to distract a vengeful spirit while Sam went to his grave so he could burn his bones and finally send him to the afterlife.
It wasn't an easy task, you and Dean were taking a beating, but you were coping well; you just didn’t know how long the two of you would last. And you were beginning to think that all was lost when you were cornered by the spirit. Both with some scratches on their faces, you with ripped jeans and a cut on your knee. You and Dean looked at each other, thinking this was the end.
The spirit rushes towards the two of you and all Dean can do is pull you against his chest and close his eyes. Then they only hear the scream of pain coming from the spirit, which was finally exorcised, indicating that Sam managed to burn the bones just in time to stop him.
You open your eyes and the spirit comes undone before you; Dean sighs in relief, still holding you tight.
"I think that's the closest I've come to a heart attack. Let's not do that again." he says, still recovering from the shock.