With only passing notice of Jane's parents as they began their day, Gideon paced nervously in their living room. He had no ability to command the mind to do his bidding, and so had no way to coerce anyone to invite the magistrate in. Nor did he want to; Jane's gift was powerful and unique, and not to be exploited or glamoured to forget it. Moreover, she was Gideon's friend after a fashion, and he wished her no alarm, tension or danger.
With the assumption that he wasn't involved in the magistrate's current quest, Gideon might well be incurring Devlin's (and the Circle's) wrath should he flee. His panic rose with the realization that he had no way out.