Aegis would have climbed out of the rubble by now, flown up for a bird’s eye view.  If Grue was doing what we’d planned, he was filling every street and side street we passed with darkness.  Aegis couldn’t see where or if we doubled back or what streets we took, so he could only identify our location by the places where fresh darkness appeared.  If he tried to close in to get us, though, we’d be gone by the time he reached us.  All he could do was follow our general location.