"I wrote this "Free Four" scene for you, my darling book pushers. It was hard for me to pick just the right one. I thought about the Ferris wheel scene, and I thought about the fear landscape scene, and both of those would have been good options. But I really wanted to choose something that would change our (I say "our" because it changed mine, too) perceptions about the story, and show how limited Tris's perspective really is, though she is a reliable and observant narrator. And the knife-throwing scene was perfect for that--once I started writing, I discovered all kinds of things about Four that I didn't know, and I knew this scene was The One."