*Castiel was attending what he believed to be "just" another mission. Sam and Dean were off at the motel getting sleep-- something an angel like him didn't need. He was checking up on a potential lead in the case, when he suddenly sensed an overwhelming power source. *

Immediately, he grabbed his angel blade-- his senses on overdrive. He didn't plan on letting this go over his head. He heard a voice and crept around the corner of the corporate building's alley, that's when he saw you.

He could sense your grace-- no, your power source? What the hell are you?

That's when he saw it. An uncanny resemblance to someone he made a mistake with long ago.

Then you noticed him.

Shit.