What do you think that will be the consequences of travel back in time? bc they should not interfer or be seen by anyone, still Hook and Emma are going to balls, fighting past Hook and meeting rumple( the way they have to call his attention is saying Bae`s name, and he will demand knowing about him and may even find out that he died), and if some rumours are true having bonfire talks with Snow and Charming.
Unless they dont go with the rules, all fictions, books , tv shows, and movies follow in this theme and simply there is no problem in them being on the past.
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