Citadel's C-Sec headquarters and nearby areas were caught by a surprise attack by Cerberus forces led by Kai Leng. There was chaos everywhere: Cerberus started a massacre -- shooting down C-Sec officers and even civilians. The officer in-charge of C-Sec operations, Commander Armando-Owen Bailey, was wounded but was still able to fight. He quickly reached the emergency locker in his office which had an M-55 Argus assault rifle, a weapon available only to senior C-Sec officers. Bailey's hands were shaking as a result of his wound but he managed to escape outside.
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There, he bumped into a panicked civilian, Kelly Chambers, who was also running from Cerberus troops. Bailey managed to calm her down, and together they were able to stay hidden for a short period of time. Bailey then learned that Chambers served under Shepard's command on the Normandy-SR2 when they fought against the Collectors, and, as an ex-Cerberus officer, was probably on the Illusive Man's kill list. Bailey said that he will help Chambers to get to the emergency landing pad and from there, they could use an autopilot shuttle to escape.
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They didn't have much choice otherwise because Cerberus troops were closing in and sneaky Phantoms were sure to discover them soon enough. There were also electric disturbances everywhere because of the damaged generator cables, which could work in their favor. Now they both had to fight their way to the landing pad. Bailey's aim was shaky because of his hands and although Chambers found an assault rifle from one of the fallen Cerberus troops, she only had limited training as a combat engineer. Keeping close together and watching each other's back, they slowly started their approach...