The paramedics bring someone in, with the help of Morris, Pratt, Shane, and Sam. Eugene yells out to Shane that he can't walk. Pratt notes that Eugene knows the system, because now his case is considered an emergency. Shane asks Haleh for a wheelchair for Eugene. She responds, "You're the doctor." Heh. I want Haleh to be my friend. Maybe Chuny can be too, but she has really bad taste in men (see Greene, Mark). Shane gives the orders, but is interrupted by some paramedics busting through the door. Susan is with a patient who was in the fire, and she's suffering from smoke inhalation but no head trauma. She's crying and yelling about how she wasn't even supposed to be there, like whatever, Dante Hicks. Shane says that her lungs are clear as they wheel her into Trauma Yellow.
Carter has joined them, and he, Susan, and Shane try to puzzle out what's wrong with the lady. She doesn't seem to have internal bleeding, or a neck injury, or a collapsed lung. The heart monitor starts going crazy, and her blood pressure drops. Carter rolls her to look for injuries on her back. Susan says there's no history of cardiac problems. As the patient continues to fail, Carter just raises his eyebrows at Susan and we go to commercial. Whuh?
After the break, Carter is preparing to intubate. Susan still can't figure out what's wrong, and she suggests that they step back and start over. Chuny is trying to take blood for testing, and Susan notices that the blood is bright red. She double-checks to make sure that Chuny hit a vein, not an artery, and then checks the patient's eyes. Carter's all, "What's up?" and Susan says that it's cyanide toxicity. Shane is (more) confused (than usual) as Susan explains that cyanide is released when certain materials, like PVC, are burned. Carter adds that cyanide poisoning is usually fatal at the scene, so presumably they don't see it much in the ER. Susan tells Chuny what to do, and Chuny does it. Susan says they should wait a minute, and then Chuny says that the patient is coming back. Carter tells Susan that it was a nice catch. Shane notices that Eugene is walking around next door, dragging his IV on a pole, and excuses himself.