Yuder and Cordelia will need to exit the Frost Anvil eventually, though. It probably will be much later than the two days the demon cult estimated to be their arrival time, so it would cause some confusion, not to mention they would appear from the wrong direction. It's also possible they will run out of patience. The search party from the town might also reach the gate before Yuder and Cordelia turn back. All things considered, the search party might get annihilated if the demon goons waiting at the gate are even stronger than the single demon-possessed and the cultists that attacked the 12 families meeting.