He now took it for granted that he should not be hanged for stealing a horse; and thought it very hard to pay so much money for a deceitful prophecy, which, in all likelihood, would never be fulfilled.
Actuated by these motives, they set out together for the house of consultation, but they found it shut up and abandoned; and, upon inquiry in the neighbourhood, learned that the conjurer had moved his quarters that very day on which the captain had recourse to his art.

This was actually the case.

He knew the fate of Sir Launcelot would soon come to light, and he did not choose to wait the consequence.

He had other motives for decamping.

He had run a score at the public-house, which he had no mind to discharge, and wanted to disengage himself from his female associate, who knew too much of his affairs to be kept at a proper distance.