Interrupt: When the effects of a triggered character, location, or attachment ability would initiate, cancel those effects.
Maybe my english is rusty, so i want to be sure i understand.
Treachery reads, the effects of a triggered character. I'm thinking the likes of Margaery Tyrell, who has an Action she can Trigger (Challenges Action: Kneel Margaery Tyrell to choose a character. Until the end of the phase, that character gets +3 STR.).
However could this card also cancel a Reaction (who i guess is also a triggered by some state) like Arya stark (Reaction: After Arya Stark enters play, place the top card of your deck on her facedown as a duplicate.) so she would marshall without the dupe ? Or even an interrupt like Davos? (Interrupt: When Ser Davos Seaworth is killed, return him to your hand instead of placing him in your dead pile.)
Thanks for the help !