Sam was on edge, and he wasn't quite sure why.

He and Dean had been cheating death for years. Werewolves, demons, vampires, fucking angels – whatever the asshole was, they'd always been able to deal with it.

But this freak was different.

Sam's spooked feeling was different.

The sound of eerie laughter floating through the air, the certainty that they were being watched.

The heart-stopping memory of Dean lying still and silent in a pool of his own blood.

It all added up to a state of restlessness that kept Sam close to his brother, and even closer to his gun.