So in FNaF 3 when you complete the 5 nights and you don't do the mini games found through out the nights, you get the bad ending where you see lights within the masks of the animatronics meaning that the souls of the children are still trapped in it. So what if after the events of FNaF 3, after this person bought the animatronics suits, he modified them for a Halloween party in his house and made them even scarier. He even made mini Springtrap dolls from the Springtrap remains After the buyer was done modifying it, he has to go to work during and his kid is home alone with the animatronics. That's when they come to life. The father leaves a little bit before midnight and comes home at 6. So the animatronics see the kid and they think that the kid should be a part of them or in some way, should be "saved".
So in FNaF 3 when you complete the 5 nights and you don't do the mini games found through out the nights, you get the bad ending where you see lights within the masks of the animatronics meaning that the souls of the children are still trapped in it. So what if after the events of FNaF 3, after this person bought the animatronics suits, he modified them for a Halloween party in his house and made them even scarier. He even made mini Springtrap dolls from the Springtrap remains After the buyer was done modifying it, he has to go to work during and his kid is home alone with the animatronics. That's when they come to life. The father leaves a little bit before midnight and comes home at 6. So the animatronics see the kid and they think that the kid should be a part of them or in some way, should be "saved".