Discussed: "Why not, though? If witches can operate in a more famous city, there's nothing stopping them here."
Conversed: "I know this show's made by BBC Wales, but really. Cardiff?
Deconstructed: The witches' plans are allowed to go much farther than they should have, since nobody thinks of witches when they think of Schenechtady, not even the nearest witchhunters (who just focus on New York City).
Reconstructed: Neighborhood watch notices the disappearances and call the FBI to investigate. The FBI finds and quickly dispatches the problem.