Dr. Benton (Eriq La Salle) is a horrified bystander as the elderly black patient (guest star Adrian Ricard) he is treating grabs a cops gun with tragic results. Dr. Carter (Noah Wyle), who is rethinking his relationship with Rena (guest star Lourdes Benedicto), teams up with Abby (Maura Tierney) to treat a class of seventh graders who become sick on their bus from mysterious toxic fumes. Meanwhile Dr. Greene (Anthony Edwards) learns the results of his review; and Dr. Corday (Alex Kingston) is determined to prove to Dr. Romano (Paul McCrane) that she can still pull long hours in the O.R.