Why Did John Faint In The Yellow Wallpaper?

Charlotte Perkins Gilman wrote the short story The Yellow Wallpaper. The protagonist, who narrates her experience in the first-person point of view, moves into a new estate with her husband in an effort to help her recover from a sickness called Nervous depression. She is placed in an upstairs room with an ugly wallpaper, and her husband disapproves of her interests and journals. She begs him to move her to a different room, but he refuses. She becomes obsessed with the wallpaper, believing there is a woman in it who needs rescuing. She tears it apart and her husband finds her crawling in the room, claiming the woman has escaped. John is shocked and faints, and the narrator is forced to step over him and his patriarchal ideals. She has finally freed herself.