Inside, McNulty gets off an elevator and looks up and down a hallway. He peers into a computer lab, but doesn't see Stringer. The next classroom is also a bust, but then we can faintly hear the boring sound of a Macroeconomics class, and McNulty looks through the glass in the door to see Stringer, rimless eyeglasses in place and everything, attentively taking notes and politely raising a finger to answer a question posed by the instructor. Idris Elba is so big and so built that the standard school desk looks like a toy with him in it. McNulty does a double-take to see what the class is, and then flattens himself against the wall, smirking in shock.
Sergeant's exam, a.k.a. "Site Of Herc's Future Spectacular Failure." Carver really seems to be suffering with it, whereas Herc blithely fills in bubbles, not even seeming to read the associated questions. After a moment, a frustrated Carver tells the proctor, "My pencil lost its point." "All the girls say so," cracks Herc, getting a laugh from his colleagues. Carver is not impressed. Next time bring a mechanical, my friend. Rookie mistake.
Then we get an establishing shot of Fells Point Copy Cat, before cutting inside to see Stringer complaining to his underlings that they have work orders stacked up for jobs that haven't been completed, and were due the previous day: "People going to to be coming in here asking for their work and nothing been done." The camera cuts to the three dudes there, leaning on a machine, one of whom spits, "Man, fuck 'em. Let 'em wait." He shrugs at the others, who seem to agree with this way of thinking. But Stringer is not amused, and advances on his employees the better to make his point: "No, you are not going to bring that Corner bullshit up in here, you hear me?" The guys sort of squirm uncomfortably, and then Stringer decides to try to educate his workforce with some of what he's just learned in class: "We got an elastic product. You know what that mean? That mean, when people can go elsewhere and get their printing and copying done, they're gonna do it! You acting like we got an inelastic product, and we don't! Now, I want this to run like a true fucking business. Not no front, not no bullshit. Understand me?" The guys don't answer, and Stringer adds, "I'm serious." One guy nods. "Fuck 'Em" Guy still seems pretty committed to his position, though.