How do the Manager and his nephew reveal their resentment of Kurtz in spite of that agent's obvious success as an ivory collector? What effect does their resentment have upon Marlow, who has overheard their conversation?

The Manager says he was "forced to send him there." They say his influence is frightful, and they add that he is alone, having sent away all his assistants. The word "ivory" is also overheard. The two men are wondering how all this ivory has arrived and why Kurtz did not return to the main station as he should have. Marlow believes that this circumstance allows him to see Kurtz for the first time. The Manager and his uncle say that either Kurtz or his assistant must be hanged as an example, so that they can get rid of unfair competition. Realizing that Marlow is nearby, they stop talking.As the Manager and his uncle discuss Kurtz, they are willing to do anything that will get him or his assistant the Russian hanged, so that the trading field might be leveled to their advantage. They can consider this plan because "anything can be done in this country." They both still retain a sense of law, but the most base components of their personalities control their intentions. For them, the civilized law of the European continent has been discarded in favor of vigilante justice. Marlow finds their attitude another example of condescending justice that is imposed on a man who has fared much better than them.