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"I felt an intolerable weight oppressing my breast, the smell of the damp earth, the unseen presence of victorious corruption, and the darkness of an impenetrable night…" (3.20)
Marlow feels the triumphant celebration of evil – now that he has allied himself with it.
"He [the harlequin] informed me, lowering his voice, that it was Kurtz who had ordered the attack to be made on the steamer. 'He hated sometimes the idea of being taken away - and then again. . . ." (3.22)
Kurtz is so evil that he would order an attack on the men sent to rescue him. This is how deeply he is addicted to his search for ivory and his place in the wilderness.
[The harlequin]: "'I have a canoe and three black fellows waiting not very far. I am off. Could you give me a few Martini-Henry cartridges?' I could, and did, with proper secrecy. He helped himself, with a wink at me, to a handful of my tobacco. 'Between sailors - you know - good English tobacco.' At the door of the pilot-house he turned round - 'I say, haven't you a pair of shoes you could spare?' He raised one leg. 'Look.' The soles were tied with knotted strings sandalwise under his bare feet. I rooted out an old pair, at which he looked with admiration before tucking it under his left arm." (3.22)
Marlow shows his last vestiges of goodness by generously giving the harlequin some cartridges, tobacco, and spare shoes to help him escape the deadly intentions of the manager.