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"A black figure stood up, strode on long black legs, waving long black arms, across the glow. It had horns - antelope horns, I think - on its head. Some sorcerer, some witch-man, no doubt: it looked fiendlike enough." (3.28)
Blackness, horns, and a fire-illuminated silhouette? Yeah, we'll pass, thanks.
"This clearly was not a case for fisticuffs, even apart from the very natural aversion I had to beat that Shadow - this wandering and tormented thing. 'You will be lost,' I said - 'utterly lost.' One gets sometimes such a flash of inspiration, you know." (3.28)
Kurtz is a "Shadow," a "wandering and tormented" soul that will be "lost" if he escapes into the wilderness. And this isn't just any kind of lost—it's lost physically, psychologically, and morally. (You know why they say about men never asking for directions.)
[Kurtz]: "'I was on the threshold of great things,' he pleaded, in a voice of longing, with a wistfulness of tone that made my blood run cold. 'And now for this stupid scoundrel—'" (3.29)
Kurtz thinks himself a force of good while the manager is a "stupid scoundrel," as a force of evil who thwarts his glorious plans. Well, we don't like the manager or anything, but we're pretty sure it's not that simple.