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At first they insisted that reinforcements be called in. The three guards who were waiting on stand-by call at home came in and the night shift of guards voluntarily remained on duty to bolster the morning shift. The guards met and decided to treat force with force.
They got a fire extinguisher which shot a stream of skin-chilling carbon dioxide, and they forced the prisoners away from the doors. (The fire extinguishers were present in compliance with the requirement by the Stanford Human Subjects Research Panel, which was concerned about potential fire threats.)

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