Something that bugg me since ouat end, why is Emma so obsesse whit Regina in all S4 especially from 4b till the end, it ve to be some meaning (i allways see too much in shows, animes, movies that make me ask "why show me this or that").
When the sacrifice happen in my mind i get this thought:
Imagine an ill person, now Regina is the body, Emma her spirit, oneself and fate their illness
From the begining is the story of a person tryin to fight fate agains all odds, sometimes the body will teach onself how to carry on the task and other her spirit will take care and fight so the body dont crumble.
At the end body and soul will be one and dosent matter what obstacles fate ve for they, now this new being can fight anything.