Too late. Alison and Chandler already noticed. They don't miss a damn thing.
Carter struts through the hall with the purposeful gait of A Hero's First Steely Resolve to Fill the Void. Abby chases him. "Do you know they sat in chairs for forty-five minutes?" Carter fumes. "They should've been isolated right away!" Abby defends herself, saying they would've been quarantined if she'd actually seen them. "Pretty hard to miss," Carter snaps, except the kids were so bundled up in blankets that we didn't see them at first, either. So pipe down, Righteous McSmarmy. Abby tersely reminds him of the nursing shortage, even as she dons the yellow ER trauma gown and gloves. "What are you doing?" Carter asks. Abby informs him that he'll need the help in there, especially if his diagnosis is right. "You could get exposed," he warns her, walking away. "I've already been exposed," Abby says in a small voice. She stares sadly after him for a second, then steels herself, dons the mask, and enters the Pox Zone.
Chandler leads a mob of angry patients anxious to confront Susan about why they can't go outside. One old woman screeches that she needs a cigarette badly, while a middle-aged man gripes, "Does this place even have a license?" Susan grabs the intercom microphone and decides to take matters into her own hands. "As you may have noticed, there are guards posted at all the exits," she begins. "This is because we have a potential public-health concern -- emphasis on the word 'potential.'" In Trauma Green, Luka and Pratt look up from Colin's body to appreciate Susan's enunciation. Chen angrily removes her lab coat as a security guard tapes a warning sign to the door of her room. "We don't have any conclusive evidence," Susan stresses. "Until we have more information, we ask that no one enter or leave the department." Carter, Robin, and Craig stare expectantly at the intercom, waiting for pearls of wisdom and drops of vaccine to pour out. Susan closes by reminding everyone that the lockdown is purely a matter of precaution, and thanking them in advance for their patience. This has the entirely opposite and predictable effect of rousing the rabble. One angry mob, coming right up. And since the ER has no demonstrably capable security forces, Susan has to elbow her way through the teeming crowd. In the background, Hooligan #1 jumps onto the back of a guard sealing off the ambulance-bay doors, and they fall to the ground in a tragicomic wrestling display.