I'm also of the school that Professor Timothy Eliot Stokes did figure things out, but decided not to let on. The man is, after all, a professor with a professional interest in the occult and very observant.
Eliot: "Very well, Julia. We'll discuss this with Barnabas. I'll meet you at the Old House after sundown tonight, as is par for the course."
Julia (Speaking very nervously, with that I've-been-caught smile while playing with the top of her blouse): "Why, Eliot; what....what ever do you mean?"
Gerard