He's in the same scenario as purple guy. He came to break the suits for remnant to LiVe FoReVeR, but doing that freed the souls. He runs into the employees only room (not safe room like fnaf three) and locks the door, hoping it to make him safer. But the dead children pass right through the door. In panic, he decides to scare them! He finds what he thinks is the Patpangolin costume. He quickly gets in the suit. But it wasn't the costume. It was the animatronic. Basically getting springlocked, without springlocks!
the design of orange guy is based off @cappykey's remaster