Anna Keegan was Sgt. Benjamin Warner's supervising physician. Keegan noted in her report that Warner responded well to the stage two inhibitor treatment, who however volunteered for clinical testing of stronger stages. As of February 11th, 1952, Keegan reported that Warner had taken both stage three and four inhibitors, the latter of which resulted in cardiac arrest due to improper antigen incubation. In response, Keegan recommended her patient to an immediate return to the stage two inhibitor.