And if you calculate the time for the above dialogue to take place--the time for Briggs and Firkin to fly to the drawing-room--the time for Miss Crawley to be astonished, and to drop her volume of Pigault le Brun--and the time for her to come downstairs--you will see how exactly accurate this history is, and how Miss Crawley must have appeared at the very instant when Rebecca had assumed the attitude of humility.

Hence Miss Crawley appeared just at this instant.
