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Ace City
The battle between the Black Serpent Mafia and Magic Ace Academy was not only confined within the premises of the campus as it slowly spread throughout the city, throwing the entire city into a state of chaos.
Given the unseen circumstances the underworld organization had overlooked, the situation worsened for them. The tides of the battle were slowly going in their favor, making them come up with this contingency plan.
Since the huge isolation formation already sealed the entire city, they better spread the chaos everywhere, making it hard for the faculty members and the police forces of the city to prioritize the safety of the citizens over anything else.
Then the Black Serpent Mafia would take advantage of the chaos to create more openings for themselves.