The door opens, and Lansky and Luciano enter Rothstein's office, but inside is Joe Masseria, and on the table is their 50 pounds of heroin. The kids are dumbstruck. Masseria is fakely cordial to Lansky, finally willing to shake his hand but feigning ignorance of his name. "Is that ours?" Lansky asks of the heroin. "Not anymore," Masseria says. So let me try to unpack the maneuverings here. The two cops who busted Luciano and who he handed the 50 pounds to are Rothstein's men. They emerge all, "Hey, no hard feelings, right?" to Lucky. Now flush with a hundred grand worth of free product (paid for my Masseria, no less), Rothstein has more of an upper hand and has negotiated more favorable terms with Masseria. Basically, they both used Luciano as a middle-man, and Luciano effectively aced himself out of the heroin trade entirely. Rothstein has the product now, for free; Masseria still has $100,000 that Luciano will have to pay him (or else, I guess, die); and Masseria and Rothstein have now agreed to divide up the heroin trade in New York.
Lansky is furious that Rothstein would have fucked them over like that. Luciano is APOPLECTIC. He lunges towards Rothstein, screaming that it was his deal, he worked for it, and Rothstein just sits behind a desk while the real men are out in the world. Lansky desperately tries to rein him in, and finally tells him if he doesn't shut up, they're dead. Lucky's hair is all mussed again. Bad day. "You know how he gets," Lansky says, by way of apology. Rothstein shakes his head: "All this time, I thought I had some civilizing effect. But there's only so much you can teach a person before you reach the limits of his capabilities." Meyer understands that, right? Lansky nods. "It's your job then," Rothstein says, washing his hands of Luciano. He brushes the kids away with a flick of his hand and steps to Masseria: he's got a proposition to offer.
That night, at the lumber yard, Purnsley and two of his pals are pissing on a car. Seemingly one of the Italians' cars, because when Capone and his cronies return home, they take some serious offense. After some literal dick measuring between Capone and Purnsley, Capone pulls a gun. This gets Chalky's attention, and he successfully buck-buck-bucks Capone into laying down his pistol and coming at him with fists. And soon enough, everybody's got a partner! From the warehouse, Nucky and Eli emerge, firing a shotgun into the air. Nucky delivers the news that Rothstein got Masseria to pull his men from the Maison Derriere, and Rosetti doesn't know this yet. He needs to speak to Chalky and Capone in private. "You can kill each other later," he hollers.