"Fred?" Sam called out, just in case she was the thing hitting the door.
He shared a look with Dean. This didn't sound good. He pulled his gun out without any thought for what the neighbors might think. Not that this apartment had any neighbors since it seemed to take up the whole floor, but still.
He didn't hesitate to kick down the door, hopefully sending whatever was in front of it flying.
"Fred?" he called again as the door swung open.
He looked around for any sign of the woman that they'd come here to protect.