If you don't want to know the circumstances surrounding Thursday's entry in this slideshow, then don't read any further...
[spoiler]Thursday's quote:
Ep #753 (1897) - Charity - 'He was there. I'm sure of it. He MUST have gone out through the window.'
From "Robservations 1/4/03 - #752/753 - Beth Learns the Terrifying Truth"
Charity says she wants to talk to Edward, but Beth tells her that he's at the Old House with Barnabas. Since she can't phone him there, Charity decides she and Tim will wait for his return. That could be very late, warns Beth. Charity asks to go into the drawing room. Beth reluctantly lets her in, and Charity notices her hesitation. There is no one to be seen when they enter the room. Charity wants to search the house, but Beth insists Edward must give permission for such a search. Charity suspects that Jamison is hiding behind the drapes and orders him out. She doesn't find him there, and figures he must have escaped through the window. I opened the windows myself, says Beth.
[/spoiler]
The Robservations only references part of the quote, and what it does reference, it paraphrases...
And Beth doesn't use "must" when it comes to Edward giving permission. Beth says, "I'm afraid you'll have to get Mr. Edward's permission to do that."