By the end of "Emerald City", characters we met at the start of the season are no longer who they appear. These are people who stand in warehouses as others choke and shoot people to death. People who allow themselves to be manipulated into a political role, only to see that role celebrated as another win for the guy pulling the strings. Capone's transformative arc is the episode's most peripheral one, centering on how an ill-timed prank prompts Al to trade in his little boy behavior (and cap) for a man's. But Nucky, Margaret, Jimmy, Van Alden become people more aware of what time and circumstance asks of them, and how difficult the consequences of their actions make it for them to look in the mirror, as Margaret does, and see if they recognize the person they once were.
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