[David Johansen]

You might give folk charms and superstitions some power against magic. Circles of salt, witch bottles, witch marks, little incantations, and children's rymmes might all offer some degree of protection. Silver bullets and other silver weapons might bypass magical defenses. Using things that don't quite fall under the definition of weapon might get around the language of a defensive spell or a trap might get around protections against ill intent. It may well be that white noise generators cancel incantations or flash bangs delay reaction speeds.