Obviously, it wasn't scientific. She bites her tongue, though, and instead thinks about what she'll have to do to keep the Doctor out of the salt and trying to explain things to him that he'll leave the sigils alone.

"Okay, so I'll call you if I have an angel problem. And if I have a demon problem, I'll call you and just... wait under siege?" She looks up from the diagram on the table. "How do I banish demons if I have to?"