So after the attack as over Marlow looks down and realizes that he is standing in a pool of blood. The blood is coming from the man who had been steering the steamboat since they began their voyage. I know there is a deeper meaning there but I am not quite sure what it is. My simple explanation is that no one seems to be safe in the Congo.
Although the helmsman was African he still had some power. He was on a steamboat carrying white men and he was in charge of handling it. What stood out to me was "but he died without uttering a sound, without moving a limb, without twitching a muscle." (70) He didn't put up a fight, he just kind of gave up. It was like he knew what his fate was and he didn't care about when his time was up. I think the helmsman's death was an indicator that the Congo was taking prisoners not matter who they were or where they came from.