Cas shook his head. "I'm neither and both," he replied simply. "It's complicated, but you did guess correctly. As for acting human, I would say that yes. You are. How long have you been among them?"
It was asked out of curiosity. Cas had yet to grasp what the difference between human and angel was. He'd not concerned himself with it primarily because Dean had so often stressed that he "behave normally." Seeing as how Cas never behaved in any fashion that was unnatural to him, he found it frustrating. Still, he did have to try. If not to appease others, then only to become a more efficient hunter.
"Then...it is much like the reapers of my world. Death controls them, but there are several others who carry out the act of taking souls. It is a very special occasion if Death arrives to collect someone himself."
He used the analogy because it was the only one he knew. Still, that did leave him with more questions. He returned the bow in kind, feeling it was important. "Do you still maintain them?" he asked. "While we're here."