Kobayashi seemed very set on the point that he wasn't going to resort to surgery, but at the same time, he had no other plan -- or at least nothing concrete. Castiel thought it over for a moment. He could see why some patients would be resistant to getting cut open. There were a lot of risks involved, and the entire act was barbaric.

Maybe the reason that it bothered him less was because this body wasn't his in the first place, so he didn't mind if it was damaged so long as a result was achieved. He'd rather take the reckless move and have this taken care of tonight as opposed to sitting on his hands.

He wasn't going to admit to his plans at this point, though, since Kobayashi might try to talk him out of it, which he wasn't interested in. "Well," he said after a long stretch of silence, "whatever you end up doing, I wish you luck with it."