A scriptwriter needs to play fair. There is something really lacking in this episode. If you are going to deal with mental problems, you need to lay a foundation for it. Just being afraid and upset isn't enough. A woman finds herself facing a threat and even though she is petrified of life, she latches on to her potential assailant. I suppose she understands him and pities him, but it just doesn't wash. The husband isn't a bad sort and he really cares about her. Again, we need some glimpse into the psyche of this lady and it isn't really forthcoming. She seems a bit too well adjusted when the intruder comes, even at the start and that's why it fails.