What if Katniss didn't voulunteer? What if Tris didn't jump? What if Harry didn't survive? What if Hazel didn't love? What if Percy didn't fight? What if Thomas didn't run? WHAT IF I DIDN'T OPEN THAT BOOK?
World vs fictional world. Hunger Games, Percy Jackson, Harry Potter, Lord of the Rings, Chronicles of Narnia, Alice in Wonderland, Peter Pan, Etc.