OnlineDM
Adventurer
4e Island, Page 40 and 42 (43rd and 45th pages of the PDF): Evelyn's stat block lists Widdershins Delusion as a Triggered Action but doesn't specify what type. I assume it's intended to be an Immediate Interrupt (if it's an Immediate Reaction it does nothing; if it's a Free Action or No Action it's insane).