A toxic benzine spill in the ER waiting room forces the evacuation of all the patients. With Weaver (Laura Innes) suffering the ill effects of the spill, Carter is placed in charge of the "exodus." Meanwhile, Corday (Alex Kingston) goes on an EMT ridealong, ultimately risking her life to treat Leo Lepziger (Joey Perillo), whose arm is trapped in the rubble of a collapsed building. This episode won an Emmy award for Best Sound Editing. ~ Hal Erickson, Rovi