Case file 7: The Bite of 87

Case File: The Bite of 87. This so call bite was mentioned by the  Phone Guy, in which someone was attacked by an Animatronic and lost his or her frontal lobe. This event is why the animatronics' movements are restricted during the day. A lot of theories have popped up around which character was responsible?

Possible Perpetrators

Foxy

It could be possible that Foxy caused the bite. This is because Foxy's attraction, Pirate Cove is shut down and Foxy's lower jaw apears to be broken along with him having sharp teeth. However, the second game rules Foxy out as the attacker because he was locked away with the other old animatronics in the Parts/Service room.

Freddy Fazbear

It could be possible that Freddy Fazbear himself caused the bite due to him having hand prints on his head, as if the victim tried to push Freddy back while he/she was getting bit. But Freddy, along with Foxy and the other old animatronics were locked in the Parts/Service room.

The Mangle

The Mangle's jumpscare.

The one animatronic that most likely caused the bite would be the Mangle due to it's jumpscare, which involves it swinging down from the ceiling at the player with its jaws open, biting the player's head. It could be possible that the Mangle bit a child, because it has a lot of contact with children and could have done it as an act of revenge for being torn apart. But actually, this is IMpossible, as Mangle, along with all the other new animatronics, were designed to PROTECT children, and therefore it could've never harmed a child in any way.

Nightmare Foxy

Another possible perpetrator could be Nightmare Foxy from Five Nights at Freddy's 4 because when his teaser image is darkened, the number 87 can be seen in Nightmare Foxy's left eye.