Heart of Darkness pg. 38-47

This section starts out with Marlow being very upset about the fact that he cant travel on for the last eight miles of the trip. The manager doesn't think it is a good idea since they saw the sign.  The crew of the ship is given copper to stop at the villages to buy food but the men are carnivorous and eat human meat.  Is this a normal thing for people in Africa to eat human?  When the fog finale lifts they start head up the river.  When they start to be under attack by the native people. Were they shooting arrows or were they unsharpen sticks? Also what caused the large smoke to appear in front of them?   The man that steers the ship gets hit and dies at the feet of Marlow.  I think Marlow didn't react to the fact that someone is dead at his feet because he was to busy trying to save the lives of the other men on the ship.