A lot of these stunts have no place in a supplementary third-party work. I didn't need to spend additional money to know that in Fate Core, stunts allow you to use skills in place of other skills in particular circumstances. For example, 'Float Like A Butterfly' allows the player to use Athletics in place of Fight while defending against an attack with dodging/agility. I would be shocked if someone didn't allow this in their games by default - I'd never charge you a stunt for it. This product is very underwhelming. Do not recommend.