[A while after the initial chaos, well into the lockdown. The fleeing crowds have, er, died out a little. So aside from the alarms, the floor above ground zero is quiet, almost pensive, as if waiting--until a burst of static rips across the hallway intercom system, followed by the ominous sound of steel doors clanging shut in unison, all over the level. A new, localized alarm begins to sound somewhere nearby.]
[Hallway intercoms] Ooh, shoot. [A long pause and then, cheerfully:] Um! Totally my bad.