[ Fear. It's unfamiliar, and that makes it all the worse. And it makes him angry that it does, at the same time. ]
It doesn't make sense.
[ His eyes are darting again, looking for a way out.
Close your eyes, Dexter.
Not his voice, not the entity parading around in his sister's form... he doesn't understand where the words came from, but they unnerve him all the more. ]