He sighs heavily and reaches up to rub at his eyes. "They work on nightmare logic, not... logic-logic. Not rules. When you have a nightmare, and something makes so much sense, even though when you wake it's patently nonsensical... that's what we're dealing with. Not exactly predictable."

He leans back in his chair and stares at the table top. "Why is the swimming pool suddenly full of sharks? Because it feels right in the nightmare. Why is your best friend suddenly someone you've never met? Because it's scary. And in the nightmare, you know that's true."