Gregory on the Loose (Part 1) FNAF Security Breach gaming Animation

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We Don't Talk About Afton! (Part 8) (FNAF Security Breach Animation)

I've watched 4 playthroughs and played the game myself and not once did I notice disappearances mentioned, except for this one line. Did I miss something? When did Gregory learn about this?

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FREDDY & GREGORY'S NEW FAVORITE HOBBY! (FNAF: Security Breach Animation)

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