Here is my thoughts I think the curse happens because they try to use Pandora’s Box to defeat Peter Pan when the box is opened the new curse is released but I don’t think they are going back to the EF I suspect the EF is coming to SB. I also suspect it brings all the nasty things like ogres from EF to SB along with RH the Merry Men, MAP, etc
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Keeper of Neal/BaelFire's Blood Magic, Neverland Crossbow, FTL Clothes,Room at Granny’s, Charming & Emma’s Father/Daughter Hugs, Henry's Neverland Crossbow, Rumplestlitskin/Mr.Gold's FTL Walking Stick