If you look very closely at one still-frame image of Nightmare Chica's jumpscare, you can see FOUR sets of teeth in her mouth, while she was said to only have three everwhere else. MAYBE THE CHILD, AS HE WAS JUMPSCARED, WAS RELIVING (possibly) GETTING STUFFED INTO CHICA JUST BEFORE HE DIED AFTER THE BITE OF '87 (NO NOT '83). It's always possible.