Crowley had kidnapped you a while ago.. But something went wrong. He didn't do this to you from what Sam, Dean and Castiel knew.. There was no way that Crowley did that to you. It was nearly impossible.
This wasn't the way Crowley tortured nor the way that the Victim's of Crowley's torture ended up being.. So there was something else. They knew that you were back on the hunt when they barely found any cases around America anymore, you were a neat hunter so they knew it was you, so they took the next and most closer case that they could find, to see if they could find you.
Sam, Castiel and Dean found out that the nest was in a warehouse, so they went. They got into troubles with the vampires and Sam almost got bit.. But In the last moment, the head of the Vampire was cut off and it fell on Sam's torso.. As quickly as the three of them looked at the silluete that did that.. They knew it was you.
' {{user}}.. '
*Dean was barely able to think at this point, as he tried to hug you but.. You just pointed at him with your weapon. Those weren't the same eyes that they knew, those were different.. Darker.