Richard explains the Candiru to Skinner. The fish is a parasite that lives in the Amazon. Skinner is offended, saying he knows not to drink the water. Drinking, however, isn't the problem, it's peeing in it. Cristina looks far too excited as she explains that the fish is attracted to urine and will swim up the stream and straight into one's urethra. I just crossed my legs, and I don't even have a penis for the penis fish to swim up. This whole story is revolting yet hilarious. Skinner is appropriately appalled, and Cristina goes on to tell the story of one man who actually saw it swim in and tried to grab it, but the fish was too slippery. Richard finally stops her, but she protests, "It's in the literature!" Apparently, now the fish is living next to his bladder and they need to go in and take it out before it causes sepsis. Skinner is caught off-guard by the idea that he could possibly die from this.
Crush is rushed into the OR, and we see Alex and Addison from her perspective as she comes to. Alex is telling Addison the epidural didn't help, but she says it will in delivery. They tell Crush that because of the blood pressure spike and resulting seizure, they need to deliver the baby by c-section. When she protests that the baby's too young at 30 weeks, Addison tells her the survival rate is really high. It's one of those things that's meant to be comforting but totally isn't, and Crush panics that she can't do it alone. Alex grabs her hand and tells her it's a good thing she's not alone, then. After this he's clearly going to go light up a barbeque.
Derek joins Bailey and Izzie, annoyed that he was called out of Skinner's consult. They have something good for him, though. It turns out the drop on Runny Nose Guy's pillow was something called a halo sign, which means he's been leaking spinal fluid through his nose. I can't quite figure out the medical specifics of what's happening, but his brain is... sinking. Bailey is beating herself up for thinking it was a cold. She also tells Izzie she won't be in the surgery since she needs to study, and that Bailey will scrub in with Derek instead. He thought she was on Skinner, but she tells him she'll do both, and that she can't not do anything when she sent this poor guy home three times before.