Abby and Carter observe Mi-Cha, her brother, and the baby hanging out together. Abby says that she doesn't know if it was the brother's visit, or their mistaken belief that the brother was the baby's father, but Mi-Cha snapped out of her denial. Carter expositions that Mi-Cha had a boyfriend across the street. Abby says that she used her brother as cover. Carter says it was good work, and walks off. Wendall walks out and wonders why Carter didn't come into the room. Abby says it was a bit rough on him, because of what he went through last spring. Wendall hasn't heard about the BABY!

Pratt helps Chen wheel her father outside while she says that she's planning to return to work the next day. Mr. Chen gets more and more agitated and starts crying. Chen tries to comfort him while explaining that he gets confused. Mr. Chen reaches down and tears out his feeding tube, and Chen starts screaming at him in Chinese before blurting out, "Son of a bitch."

Cut to Luka saying, "Son of a bitch." Tandem cursing! I approve. Louise is crashing. Sam starts compressions and uses the defibrillator, to no effect.

Pratt helps Chen to put her father in soft restraints. A nurse asks if she should register Mr. Chen first, and Chen tells her not to bother. The nurse looks at Pratt for confirmation and Chen gets all offended that her authority is being questioned. The nurse leaves, and Chen snaps on some gloves. Pratt says gently that her father should be in a nursing home. Chen says she'd never do that to him. Pratt doesn't think she should have to do this, either. Chen asks Pratt to watch her father's hand as she jams the tube into the hole in her father's stomach. I hope this whole "Chen's father is abusive and Chen is abusive back" thing pays off at some point. I appreciate that, in real life, these situations can last for years, but they keep hinting at more going on, and I'll be annoyed if it is dropped like so many other percolating storylines.

Louise is not responding to treatment. Susan walks in and gets the report from Luka, and comments that aspiration shouldn't result in cardiac arrest. Luka "theorizes" that the balloon on the crike must have burst. Susan kind of looks at him like, "What kind of crazy Croatian medicine are you practicing?" Luka says, "It happens." Sam continues treatment, to no avail. Luka tells her to hold compressions, and he calls the time of death. Sam stares off in shock, and says hoarsely that she'll clean Louise up. Everyone else exits the room. Luka says that it's a coroner's case. Sam says that when they do the autopsy, they'll see that the balloon didn't burst. Luka morosely walks over to the cabinet and takes out a syringe. He injects air into Louise's tube and says, "No. They'll see that it did." Sam looks torn between being touched that he would cover for her and worried that she put him in that position. And also upset that she basically killed Louise. Luka stomps out, passing the detective on the way. Sam closes her eyes, guilty.