Sure enough, we cut to Dr. Dave, sprawled face down on a bed. Lisa comes in with a guy in a wheelchair and, after three attempts, awakens Dr. Dave. He leaps up, startled, and insists that he's okay, but he has a big round mark (from his stethoscope? I can't tell) on his cheek. He takes off, flustered.

The punk trio mess around with some equipment in a curtain area. Punk #1 has something with a probe of some kind that he's trying to stick in the mouth of Punk #2 as Punk #3 objects, "No, man, you gotta stick it in his butt!" Mark bursts in and asks what they were sniffing. They feign ignorance. "On the bus," Mark elaborates. Punk #1 asks, "Did you smell something on the bus?" "Yeah, Mrs. Linden's farts," says Punk #2. Mark steps forward and ponderously bluffs, "We found chemical solvents in your bloodstream. Some of your classmates are really sick." Punk #1 notices that his arm is bleeding profusely where (I presume) they stuck him, and he asks Mark for another band-aid. Mark ignores the request and demands, "I need to know what it was! Butane? Paint thinner? Adhesive?" No one answers. Mark declares, "Okay, fine. We'll do more tests." He takes Punk #1 (calling him "Bo" -- well, no wonder the kid's a bully with a dumb-ass name like that) with him, and casting a threatening glance over his shoulder at the two remaining punks.

Cut to Bo (formerly Punk #1) on a bed in an exam room. "What kind of tests?" he quavers. Malik, wearing huge blue rubber gloves, warns him to lie still. Cut to BoCam, where we see that Mark and Malik have assembled every piece of equipment in the hospital around Bo's bed. Seriously, I think I see the microwave from the doctors' lounge. Mark, sterilizing a spot on Bo's jugular vein, bullshits, "We take the blood, and label it with radioactive hydrogen, and then we reinject it in your body and do a nuclear scan." Malik passes Mark a huge needle filled with something that looks like apple juice. "Really?" chokes Bo. Mark claims that it's the only way to identify the chemicals. They start to lower something onto Bo's head, while inching the needle toward his neck, and Bo relents: "It was spot remover." Mark stops the equipment moving and asks what kind. Bo says it was carbon tetrachloride. Mark tells Malik to order liver panels on the trio of punks. Bo asks whether he's going to be okay, and Mark says he hopes so.

Carter enters a brightly coloured nursery and asks a pretty young thing whether Rena is there. PYT says that Rena is just finishing up with a patient, and asks, "Dr. Carter, right?" Carter confirms his name and asks whether they've met. PYT curtly says, "No. I'll let her know you're here." D'oh! Rena's been talking about her boyfriend! PYT takes off. Carter wanders over to a model of a human torso and touches it, causing its innards to spill out in a loud clatter. A totally adorable little boy standing near the table tenses up his shoulders and grimaces in this very cute and comical expression of "trouble!" Or perhaps, "dude!" I can't really describe it. It's cute, though. PYT comes back to see the mess Carter's made. He apologizes, and she explains that the model always does that. They both start to put it back together, and apparently he's doing such a bad job of it that she's moved to ask, "Are you sure you're a doctor?" Carter preens that he was a surgical resident for a year, and PYT cracks, "I guess it's easier taking things out than putting it back in." Rena walks in, and Carter tells her he accidentally eviscerated the model. Rena says she heard about the shooting, and asks whether he's okay. Carter says he is, and then shakes his head in an affected "what a world" way. Rena asks whether he wants something, and Carter says he's been doing a lot of thinking about the two of them: "I realize that I may have been --" "Stupid?" she finishes for him. Carter says that he was going to say "wrong," but that maybe he was a little of both. He says that he enjoyed the time they spent together, and that he'd like to do it again, and asks her to lunch. She asks him about "the age thing." He says it's "not an issue. Anymore." Without giving a straight answer, Rena hands him a piece of the model and flirts, "You dropped your spleen." He asks if that's a no, and she says she'll think about it. Wah.