While Matty suffers all alone in his room, Nick tells his parents that he wants to die to save Matty. Obviously, his parents don't want this to happen. "It's time for me to go, Dad. You gotta let me go," he says. The parents fall apart. They love Nick so much more than Matty. Nick says if he saves Matty, they won't be alone. Yeah, they'll be stuck with the kid they hate like House is stuck with that dog.
Cuddy's leading Nick out of the clean room when Foreman rushes up and tells them to get him back in there; he's figured out what's wrong with Matty. He has histoplasmosis, a fungal infection from the chicken shit that he came into contact with when he was making a pitcher's mound in the backyard. You see, the neighborhood that Matty and Nick live in used to be a farm, as apparently indicated by the water pump. I guess we didn't see the sign on it that said "SPECIAL FARMER WATER PUMP FOR FARMS." The dirt Matty dug through was probably where a chicken coop used to be. And the fungus lived forever in there, waiting to be unearthed so it could kill some innocent child in an unfortunate series of events. Wow, even chicken shit hates Matty. Foreman says they can now treat Matty and he'll be fine. No one cares about Matty, though, and the parents immediately ask if they can clean Matty's marrow in time to give it to Nick. Cuddy has to tell them that the infection is attacking Matty's marrow, so there's no way Matty will have enough in him marrow in time to save Nick. Stupid dirty New Jersey. Honestly, between that cat lady who got poisoned from ancient shared pipes and Matty almost dying from old farm crap, I'm starting to think the homes of New Jersey are just full of secret hidden deathtraps.
Foreman treats Matty, who's all alone because his parents are with Nick. Foreman has a plan, though. He asks Matty if he's willing to risk his life for Nick the way Nick was going to for him. Of course, Matty says yes. Foreman says that he can't sedate Matty because he's "too sick," although not too sick enough to have his bone marrow removed in the first place. Foreman ties Matty down, and Matty's face of horror is pretty spot-on. If your doctor is tying you down before a procedure, you know things are going to be rough. Foreman sticks the giant-ass needle into Matty's leg bone and starts sucking out the marrow. Matty screams in pain and begs Foreman to stop, but Foreman says he's going to need "a lot more" from as many of Matty's bones as he can get. Oh my god. Even Liz Friedman, the writer of this episode, hates Matty.