The other option is Counterweaving. This requires the Realm Fae: 5 and a knowledge of Gremayre. To Counterweave, you must spend a point of Glamour and then roll Wits + Gremayre at a difficulty equal to the Glamour rating of the cantrip's caster. To successfully counter a cantrip, you must achieve equal or more successes than the caster. The point of Glamour is not forfeited if the Counterweaving is unsuccessful.
Familiarity with both the cantrip being cast and the Realm in use reduces the difficulty of the Counterweaving roll by 1. If the Realms used in a cantrip are not readily apparent, you may roll Perception + Kenning (difficulty 6) to determine their nature. At difficulty 8, you can determine the exact Art being used.