Austen Said:

By a most fortunate chance his leaving Highbury had been delayed so as to bring him to her assistance at this critical moment. The pleasantness of the morning had induced him to walk forward, and leave his horses to meet him by another road, a mile or two beyond Highbury— and happening to have borrowed a pair of scissors the night before of Miss Bates, and to have forgotten to restore them, he had been obliged to stop at her door, and go in for a few minutes: he was therefore later than he had intended; and being on foot, was unseen by the whole party till almost close to them. The terror which the woman and boy had been creating in Harriet was then their own portion.

He had been detained by a temporary increase of illness in her; a nervous seizure, which had lasted some hours—and he had quite given up every thought of coming, till very late;—and had he known how hot a ride he should have, and how late, with all his hurry, he must be, he believed he should not have come at all. The heat was excessive; he had never suffered any thing like it— almost wished he had staid at home— nothing killed him like heat— he could bear any degree of cold, etc., but heat was intolerable—