As they speedboat out to the location, Drs. Ben and Clark catch Mina and Plastics up: Two Americans, a father and daughter, were scuba diving in an underwater cave and there was a rock slide. The dad's free but the daughter is trapped, and the coast guard wants doctors on hand for the rescue. When they get to the boat, they find the father with his back all torn up, struggling with the coast guard to let him go and to save his daughter. Ben and Clark suit up, dive in, and find the daughter's leg very much trapped. She's got one of those dry-erase whiteboards that apparently function just fine underwater and she shows it to the doctors: "Help me." Title card!
Back at La Clinica, Lily, Zee, and Cole gab about the patient at sea (we learn that the coast guard is sending a winch to remove the rock, but they're three hours away; they have backup air tanks to keep the girl breathing). When Lily leaves, Cole asks Zee why she didn't stop by last night, and she tosses off a pretty basic excuse about patients and being tired. She then spots one particular chart and her face lights up, and she runs out to meet "Angus" (who is Scottish, tall, and hot). Angus Sinclair, as Cole tells Lily and an apparently-has-no-friends-his-own-age Charlie, is a cultural linguist of some sort who "shows up once a year to try and get into Zee's pants." Cole, obviously, hates the guy, and Lily and Charlie laugh at how obvious he is about it. They disperse and Cole approaches Angus, who's gifted Zee with a bag of some medicinal herb or another that he was given by the last native tribe he was working with. Cole asks him what kind of tapeworm they'll be fishing out of his butt this time. Angus says this one's just a skin rash. Cole: "Oh, so syphilis, then?" Zee tells them they both have "huevos gigantes" and tells Angus she'll have a look at the rash. Cole takes his leave, but not before planting a big, conspicuous, territorial kiss on Zee. It's all very charming.
Back on the boat, Mina and Plastics are tending to the dad, Nick (who I guess has been on The Good Wife? Because at this point, who hasn't been on The Good Wife?). He's got shards of coral all up in his upper back, so Mina's removing those -- which seems painful -- and Plastics is warning him that if he starts to feel nauseous, he could have coral poisoning. So, you know, watch out for that. Dad starts to exposit about himself and his daughter: he and her mother divorced, and he and the daughter aren't close at all. He looks as pained by this as he does by the coral shards being tweezed out of his shoulder.