Lie low
Dmitri tells his men to lie low: moving money and product during the experiment would draw attention. Capital A disobeys and joins the Purge.
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The night in the building
Two women sent by Capital A try to kill him in his office, and Dmitri fights back. He defends himself against NFFA mercenaries, uses plastic explosive with Nya and survives.
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The island's hero
When the sirens sound, a wounded Dmitri is hailed as a hero and says the survivors must fight back.
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In comics and books
According to Wikipedia, Y'lan Noel leads the cast of The First Purge, alongside Lex Scott Davis, Joivan Wade and Steve Harris.
May contain spoilersCovers the books and things that may still show up on screen.