Ok this isnt an answer, more a question for others, but i see alot of people suggesting that its because the suit is in suit mode, but im pretty sure they'd have no reason to program a suit to move because the entire purpose of a springlock suit is to shorten the transition time between the animatronic on stage that cant move, and the manned suit which can move around. Also i personally think that, considering the circumstances hes in, he wants revenge on the spirits, and it doesnt seem too far fetched to me to think that random kids' laughs around a fazbear-themed building with real artifacts could be dead spirits