Admittedly, Dean isn't exactly one to run towards the nearest voice that speaks up - he's got more trepidation than that built into his veins. So it takes him a good solid moment to begin creeping forward, peering around the edges of the staircase, trying to look for the source of the voice. He's missing his Colt something fierce right about now, too nervous to know quite what to do with himself.

A fact that only gets so much worse when he's caught off guard, by-- what even is that? A robot? What the fuck is happening here?

"You- you're-" What the shit. "You tryin' to be a bootleg C-3PO?"

Yes, right now, that's the best he can come up with.