Presently I heard Pilot bark far below, out of his distant kennel in the courtyard: hope revived. Nor was it unwarranted: in five minutes more the grating key, the yielding lock, warned me my watch was relieved. It could not have lasted more than two hours: many a week has seemed shorter.
Mr. Rochester entered, and with him the surgeon he had been to fetch.
The sentence with the highlighted part is using the present perfect tense; yet, the previous and the next ones use the simple past tense. What's the reason for that?