I have a little fnaf 2 theory. Does Old Bonnie take off your mask for its face and Mangle helps? I have evidence. Old Bonnie's jumps are depicts it as grabbing. Maybe it's grabbing at your mask and it takes it and wears it. A nearby animatronic hears Old Bonnie and then you die. Mangle's jumpscare depicts it biting at your head and possibly grabbing the mask, then a nearby animatronic hears this and you die. Tell me if you believe this theory. I know fnaf 2 is kind of old but I join after it was big. So yeah. Peace, love and fnaf.