In the episode Hat Trick, we see that Jefferson remembers his curse and is forcing Emma to believe. Jefferson believes that the only we he can get back his life and daughter is if Emma can make the hat work and he can return to Fairy Tale Land. He believed that Emma was special and had magic.
His plan of action was to kidnap Emma and force her to make the hat. He also kidnapped Mary Margaret as bait.
When Emma was able to knock Jefferson unconscious, she tried to free Mary Margaret so they can escape. But not without a little fight from Jefferson. As he held Emma at gunpoint, Mary Margaret whacked him from the back and pushed him out the window with his hat on.
When Emma and Mary Margaret look out the window, all they see are glass shards from the window and the hat Jefferson was wearing.
Where did Jefferson go? Did the hat work? Does Emma really have some kind of magic that made the hat work? Or did Jefferson get away somehow?
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