I am thinking that the SPELL can be broken by showing regret remorse, concern for the person that you are angry at.
ANNA showed remorse about putting her sister in the urn while under the spell.. she started crying therefore washing the mirror shards from her eyes. ( In Anderson’s SNOW QUEEN, Gerda tears melted the boy’s icy heart thus breaking the spell.)
I predict that CHARMING will be concern for SNOW while she is fighting with REGINA. WHAT will result in remorse / regret in Snow and Regina I do not know what that will bring it on… Maybe someone getting injured.
ONCE they are cured then they can spread the cure to others in STORYBROOKE.
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