Pan from Benton, rubbing his head in the hall, to an orderly carrying several bags of blood into Discharged Passenger's trauma room. It doesn't sound good for Discharged Passenger. Carter asks to intubate, but Mark firmly replies, "Not this time. Could be a neck fracture. Always look everywhere. We'll roll him." They roll him, whereupon Mark discovers a "single gunshot wound." They roll Discharged Passenger back. Long story short, he lives. I would get into it more, but the point of the scene is to show Mark teaching Carter and Deb, and saving the dude so that he can go up for surgery.
In the hall, everyone ditches their yellow gowns. Susan says that she has to get home: "I'm on tonight." Mark says he'll have the place emptied out for her. "Deal!" she chirps. Lydia and Susan make off for the El together; Lydia will be back that night as well. A cranky bald guy mutters about getting stat paged, and enters Mrs. Benton's trauma room at the same time as a younger woman in surgical scrubs. Benton tells Dr. Cranky that the patient is Benton's mom, and that she broke her hip. Dr. Cranky, giving a cursory glance at an x-ray, dismissively agrees that she did. He hands the films to Scrubs Girl, calling her "Blair," and tells her to put Mrs. Benton on her schedule. Dr. Cranky turns to go, and Benton follows, explaining that he wants Dr. Cranky to perform the surgery. Dr. Cranky wearily says that ER admits go to the teaching service. Benton says that he doesn't want a resident operating on his mom, and Dr. Cranky says he'll scrub in. Benton asks whether that means Dr. Cranky will be the one holding the knife and, before Dr. Cranky can answer, adds that he wants to scrub in, too. Dr. Cranky says that he will be there, and Benton snaps, "That's not good enough, sir!" They've arrived at the elevator by now, and Benton is all up in Dr. Cranky's face. Dr. Cranky, in a warning tone, tells Benton, "I know this is your mother, but you are way over the line, son!" Haleh and Blair roll up behind them with Mrs. Benton's bed; Dr. Cranky gets in the elevator with them. Benton tries again, but Dr. Cranky cuts him off: "I'll page you when we're done. Now back off!" The elevator doors slide shut.