I don't know if anyone knows this theory but I like it and I'm also going to make a story about what happened after it so follow me to read that. But what the theory is it's that The Mimic is drumroll please 🥁🥁🥁WILLAM AFTON!!! Of course. Would this be a fnaf Theory if willam wasn't apart of it. And the mask that Cassie uses (it's called a security mask but we all know what it really is) is used to possess people (that's why it's a vanny mask) Vanessa made M.X.E.S to keep the Mimic down in the basement but also to make sure you don't have the mask on long enough for willam to get you. That's why it keeps kicking Cassie out. For anyone who doesn't know the ending that this happens after is princess quest ending which is where you free Vanessa from Glitchtrap. NOT THE AFTON ENDING. I know a lot of people think that it's after the Afton ending but it's not. To get the princess quest ending you need to get the Vanny ending which takes place in fazer blast. And Freddy losses his head. Which we see in Ruin. Also Vanny's Mask is just there? We see in the princess ending Vanessa takes off the mask.I don't think Vanny would take off her mask let alone leave it by it's self for someone (Like Cassie) to take it. So when Gregory said "we" he didn't mean him and Cassie. He meant Vanessa, Freddy and him. He didn't want Afton to find them. So does that make Gregory evil? It's Cassie life or... ARE YOU KIDDING ME I HAVE TO DO MATH!!!!!!! AGGHHHH. Okay so William kills about 5-6 kids per killing. Wait...OKAY YOU KNOW WHAT FUCK THE MATH!!! It's a lot of kids and people dead. So Cassie life or the world. Or you know what just have Cassie come not put the mask one and once she's over burn the mask. Cool! Also this is the what happened in my AU.

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Aftermath
FanfictionWhat happened after the fall did cassie Survive? Did Gregory really drop the Elevator?