Dean knew the look on Sam's face, and he was sure he had one of his own. They were there to help Fred; he really didn't want to think they were too late. He'd been hoping that they weren't there to do more than make sure the woman had her music or tv on too loud.
What he saw though...
"What the fuck." The gun was up before he came into the apartment fully. Strange sounds registered much quicker than the not so strange in these situations, and he stepped inside. The place was a mess, and he was busy looking for the sound.
There it was up in the corner. "I repeat, what the fuck." His gun was pointed at it, whatever it was, and he spared a glance at his little brother before focusing on the thing on the wall.