Having briefly skimmed the thread, I don’t see why Lake Nostros wouldn’t be able to cure Neal’s wound, since Charming tried using precisely it to cure his mother from a poison arrow one. And in a finale so full of things happening they can’t overextend themselves with this subplot.
But Ruth didn’t drink the water. She faked it and then let Snow drink it during the exchange of vows at the wedding. If she had drunk the water, it probably would have worked.
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"He was a lot of things to me" "The only conclusion was love"