paragraph:  There were others far more perturbed by that odd conjunction of diners than the puzzled host, who merely expected Mrs. Bates to belabor him with a rolling pin.  Mr. Siddle, for instance, had just closed his shop when the five met.  That is to say, the dark blue blind was drawn, but the door was ajar.  He came to the threshold, and watched the party until the bridge was neared, when one of them, looking back, might have seen him, so he stepped discreetly inside.  Being a non-interfering, self-contained man, he seemed to be rather irresolute.  But that condition passed quickly.  Leaning over the counter, he secured a hat and a pair of field-glasses, and went out.  He, too, knew of Mrs. Jefferson's weakness for shopping in Knoleworth, and that good lady had gone there again.  Her train was due in ten minutes.  A wicket gate led to a narrow passage communicating with the back door of her residence.  He entered boldly, reached the garden, and hurried to the angle on the edge of the cliff next to the Martins' strip of ground. 
question: How do we know that Mr. Siddle had just closed his shop?
answer: Five met