Why don't Jules & Vincent immediately kill everyone in the apartment except Marvin?
In the opening scene of Pulp Fiction (1994), hit-men Jules Winnfield and Vincent Vega raids the apartment of Brett, a business associate of their boss (Marsellus Wallace). The main objective is to retrieve a briefcase of Wallace's from Brett's apartment. They seems to be sure that Brett has the briefcase and Vega eventually finds the briefcase while Jules keeps talking to Brett.
But I wonder, what exactly do they plan to do with Brett and everyone else in the apartment? Sending a message could work if they non-fatally shoot Brett and left him alive to show not to mess with Wallace. But they kill him and the others, except one teenager named Marvin, who was apparently their informant (who accidentally gets shot by Vega and dies sometime later).
The other possibility is that they always planned to kill Brett. But why waste so much time engaging in a lengthy conversation? Why not just shoot everyone else and make Brett hand over the briefcase, and then kill him as well? The longer they wait, the more chance of the plans going awry. This actually happens, as a man bursts out from the bathroom and shoots them, which they miraculously survive.
On why they did not kill Marvin. Thank you users BCdotWEB and galacticninja for pointing that out in that other question.
Best Answer
Pulp Fiction is expressly about the supporting characters in the background of classic gangster pulp stories - the henchmen, the moll, the boxer who is supposed to throw the fight, etc.
It explores these characters but maintains the tropes of the genre from which they are drawn. One of those tropes is that when the gangster sends the henchmen to kill someone, they chit-chat about it. They can't just execute the best possible tactical operation - they have to frighten and taunt Brad and his associates, and deliver the gangster's "message". That is one reason the briefcase is undefined as a MacGuffin - because it doesn't have to be anything specific, since it is standing in for all such MacGuffins in classic crime films and this scene stands in for all scenes where there is a confrontation over the MacGuffin - and those are classically always dialogue-heavy and exposition-heavy.
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Did Vincent intentionally kill Marvin?
Either it was intentional, or Vincent isn't exactly the brightest or most cautious guy. Vincent shoots Marvin right after Jules says he is retiring. And although they are just coworkers, maybe Vincent wanted Jules to stay in the business just a little longer so that he could still work with his friend.Why dont they kill Marvin?
They did not kill Marvin because he was part of Wallace's network and was an informer in the gang.Why did Jules shoot Marvin?
Knowing that Marvin would die a slow, painful death, Vincent and Jules decide that Marvin should be shot in the head and put out of his misery.More answers regarding why don't Jules & Vincent immediately kill everyone in the apartment except Marvin?
Answer 2
In addition to tbrookside's answer a logical in universe answer is that Jules and Vincent wouldn't kill anyone (important) until they have what they came for. You never know if the case is in the apartment but Brad hid the contents somewhere else for instance.
Answer 3
Everyone seems to be satisfied with TBrookside's meta answer, but OP's original point is badly taken.
There's no one in the lobby, but throughout the 3½ minute single take while Jules & Vincent walk around the apartment complex talking about Marcellus Wallace & Antwan Rockamora they repeatedly encounter incidental noise showing that the entire floor is full of people. Either floor up or down is presumably also full of people starting their day.
Even in universe, the thing to do here is to get everything they can before opening fire. Some of the neighbors are playing loud music, some are presumably still sleeping, but people are going to hear the gunshots and—at minimum—get the police on their way towards the complex. They know they have 15 or however many minutes, but they aren't going to needlessly risk returning empty handed.
Vincent even pointedly reminds you this is on his mind in a later scene:
VINCENT
Do you wanna continue this theological discussion in the car, or at the jailhouse with the cops?
As it turns out, Marvin knew the current location of the case and Jules mostly shuts him up to maintain his dominance of the scene. Walking into the room, though, they couldn't know whether the others had moved it; letting the guys think they might live turns out to be the best option for getting information; and—if it had been moved—Brett's best play for dying without torture and causing more trouble for his killers would've been to claim that he had given it to Roger (the guy on the couch who they'd just shot). There'd be no way for Jules or Vincent to quickly extract any other information because (again) the cops would already be on their way and they're not about to slowly haul Brett all the way out to their car, screaming as he goes.
They did it the way they should've. Even Jules messing with the guy's breakfast is gauging how submissive these guys are—Do they have a plan? Are they going to cause trouble? The idea that they could've just used Marvin to find the case is based on knowledge they wouldn't've had at the moment. (The way things play out imply he was attempting to double-cross them anyway.) The idea that they keep talking needlessly after they get their information is off: the conversation after that is just Jules quickly shutting down Brett's attempt to talk his way out of this shit.
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