I could see the Yellow Brick Road being a portal, but it is hard to know until the writers reveal more of their plans. They might be changing a lot in their storytelling for next mini-season, knowing the ratings did not improve and Wonderland tanked.
Maybe the Yellow Brick Road isn’t a portal so much as a bridge between the two worlds–SB and the EF–allowing people to cross without needing an actual portal.
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"He was a lot of things to me" "The only conclusion was love"