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[The harlequin]: "'He [Kurtz] made me see things—things.'" (3.2)
We have to ask: did Kurtz happen to pass along any pharmaceuticals, too? Because if he's making the harlequin "see things" (unnamed things) just with words—that's pretty crazy. In all senses of the word.
"[…] as a rule Kurtz wandered alone, far in the depths of the forest." (3.4)
Kurtz willingly isolates himself from his friend, the harlequin—and by now, we know that isolation is a major warning sign for subsequent insanity. (We knew we needed to get out more.)
[The harlequin]: "'You can't judge Mr. Kurtz as you would an ordinary man. No, no, no! Now - just to give you an idea - I don't mind telling you, he wanted to shoot me, too, one day - but I don't judge him.' 'Shoot you!' I cried 'What for?' 'Well, I had a small lot of ivory the chief of that village near my house gave me. You see I used to shoot game for them. Well, he wanted it, and wouldn't hear reason. He declared he would shoot me unless I gave him the ivory and then cleared out of the country, because he could do so, and had a fancy for it, and there was nothing on earth to prevent him killing whom he jolly well pleased. And it was true, too. I gave him the ivory. What did I care! But I didn't clear out. No, no. I couldn't leave him. I had to be careful, of course, till we got friendly again for a time.'" (3.4)
It looks like the harlequin has gone a little crazy, too, sticking to Kurtz even though Kurtz threatened to kill him for ivory. Don't know about you, but we prefer our friends not to be homicidal maniacs.