There wasn't exactly a choice when it came down to it. Stay, and be swallowed up whole by whatever the Hells that thing was, or go with the vampire, brave wherever it was that they were taking him to, and hope they didn't die on the way there. Cas was cautious to stand, weary and, slightly wobbly, but he stood, and he followed. The world around him was unknown and dark. Cas had read every royal handbook in existence, had attended every class, and every meeting, and never spoke out of turn or stood out of line. He knew how to stand and sit in every scenario that royal life could have ever prepared him for, but this? This was definitely not in any handbook he had ever found.
Every step was careful. Caspian stepped exactly where the vampire did. The quiet of the forest was deafening. Every rustle or crack and snap echoed, and he felt his breath was too loud, even for him. So different from the world of glitter and the clinking of glasses that he had come from. He wondered whether his father had noticed his absence by now. Whether they were calling for him, trying to reach him and find him in the dark surrounding the castle. No one would be stupid enough to enter the forest. No one would even think about it. It was Caspian's own, stupid fault for wandering too far.
Well, at least the vampire could speak the common tongue, that made things a little easier. That was if they tried to speak to one another again. Caspian didn't want to speak out of turn or say something that would bring about an early death. Or maybe they only knew a few words and weren't fluent? his brain was figged with thoughts swirling and meshing together, and none stayed long enough for him to focus on them longer than a minute.