The mastermind behind the arena takeover, a former Secret Service operative turned terrorist. He rigs the stadium with explosives, hostages VIPs, and orchestrates a massive financial heist while eliminating dissenting hostages.
Foss's operation directly opposes the Secret Service response.
The Secret Service joins the police in surrounding the arena, while Foss leads the terrorists holding hostages inside and preparing explosives.
Hallmark covertly supports Foss's hostage operation from inside the Secret Service.
Matthew Hallmark is revealed to be secretly in league with Joshua Foss and attempts to kidnap Tyler during the arena takeover.
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