"Is that your safe word?" Because there wasn't much other reason to use it right now. There wasn't enough panic behind it to be warning him of an actual Leviathan, though there were some still out there.

He reaches for his knife, watching Castiel's face. "I'm going to cut these ropes away, all right?" It's an effort to keep his voice steady, because he's just that angry at the moment. There is no reason for a sub to have been left alone like this, none at all. Though Sam can't help but be grateful because it means that Castiel was able to call for them. "I'm right here and I am not going to cause you harm. I'm just going to free your hands."