This very suit was in the room he was getting chased into, and for some reason he put it on for protection or something. Now, to explain it fully, animatronics have and endoskeleton of which has all the functioning stuff, and since the earliest version wasn’t as advanced as the others, and didn’t have the same fudged, they decided to make a mechanism of which all the things that hold up the endoskeleton in place can be cranked back with springs, for a human to preform in. The problem is that these can possibly snap shut, it’s like putting your fingers on a spring, and if you slightly move one, it will spring out and fling out. In this case, the ‘out’ is being covered by a humans body, and the spring is connected to the suit, and the springs can be tripped by moisture, due to the friction between the spring getting slippery.
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In the very mini game the room is shown some dripping water in the ceiling, of which caused the spring locks to snap shut, impaling Afton in literally every part of his body, causing his horrific death. Considering that anything that dies or is stuffed in something, ends up possessing it, our pal always comes back, but is a horrific corpse inside of a old damaged suit. Now, since this pizzeria wasn’t closed, they eventually found out Afton’s corpse and instead of cleaning up the mess, just downright close of the entire room as if it did not exist. Now let’s go back to Micheal, after having literally everyone in his family die, he probably decided that his best course of action would be to undo all the problems his father caused.