The plot is secondary, only the story outline is necessary ("honest citizen" buys into a onetime drug deal which goes bad and there are serious consequences) to act as a framework around the events that unfold. We do not need details of who, what , where or when regarding the drug deal, we only need to see the greed and the evil it leads to, play out.
Yes the dialogue is metaphorical, gloriously so, and the actors deliver this as it was intended to be delivered by the writer and the director. This dialogue is superb in setting the ominous tone for the film, we do not need to know who is picking up what and delivering to whom, we only need to know that it didn't happen and somebody has to pay, pay a price beyond imagining! While there are moments of amusement, it is a deadly serious morality tale that does not play out to our long established preconceptions. Decisions today can make for impossible decisions and terrifying consequences tomorrow.
