“That’s not a threat. It’s a promise.” If he had any other options here, he certainly wouldn’t have been working with a demon– and he’s still not particularly pleased about the arrangement at all. Angels and demons don’t work together. Demons are abominations, and that particular opinion isn’t about to change anytime soon. But Castiel knows that if he tries to get out of this on his own, it’s not going to end well. For the time being, he’s going to have to swallow some of his pride while keeping his wits about him. “I’m still an angel. So I suggest you continue not to try anything.”
“It’s a promise now?” He couldn’t help, but to roll his eyes at that, “Well, good for you,” he replied sarcastically, “Maybe you should say a few more of them.” In truth, Ky’lar shouldn’t have been so harsh on Castiel, but as the facts stood, he was an Angel, and Ky was a demon. Getting along or even working together ( for any length of time ) wasn’t going to happen easily…. even if they were stuck in this, “In the meantime, you can make a promise to find a way to get us out of this situation, yes?”