You see, Handy's plan, such as it was, took action precisely two hours after he had gathered his would-be jail-breakers together. Long enough for the near countless soldiers to do a sweep or two of the city while they hid, yet not long enough for even the most impatient of city dwellers hiding with their families to stick their heads out and look around. Long enough that it was reasonable to assume Chrysalis was out of her cell and right where the leaders of the changelings could see her… and each other.