Carter's (Noah Wyle) ongoing personal problems -- including unauthorized injections of pain medication -- culminate in a tense confrontation with the ER staff. Elsewhere, Benton (Eriq La Salle) and Kovac (Goran Visnjic) are helicopter-dropped into a deadly shooting incident at a school, where they are forced into a tough decision as to which shooting victim should be treated first. This final episode of ER's sixth season culminates in a cliffhanger involving a plane flight to Atlanta and two of the aforementioned characters. ~ Hal Erickson, Rovi