The episode’s major revelation is that the mystery vigilante is Sara, who survived the Queen’s Gambit . Her crucible—revealed in flashbacks to be the freighter Amazo —turned her into a hardened warrior. She struggles with "loving the fire," feeling she cannot return to a normal life after the things she has done.
A "third type" who learn to love the fire. These individuals choose to stay in their personal crucibles because the pain is the only thing they truly know anymore. Interlocking Crucibles [S2E4] Crucible
Those who grow stronger from the experience and survive. The episode’s major revelation is that the mystery
Break down the of Brother Blood and the "Mayor." A "third type" who learn to love the fire
The "deep piece" of this episode lies in Sebastian Blood’s monologue to Oliver, which categorizes how people react to extreme hardship: Those who are consumed by the fire and die.
Oliver acts as a mirror for both sisters. He is trying to prove he has moved past his island crucible to become a "better man" by sponsoring a "Cash for Guns" event rather than just using violence.