Since in this AU henry cant exist, unless they do like S4 stuff, Henry is there to convince them, that is not real.
So is end the question is finding if this one epi Au thing, where Regina and Emma may have to work together to set things right, Or this is a full arc until ending of season, bc in that case means no Henry, unless like i said above he is there convincing them is not real, so i say is probably a one epi AU.
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