Re-read the passage on page 38-39 where Okonkwo attempts to shoot Ekwefi. How is this scene symbolically linking Okonkwo with issues of masculinity and impotence?

This is the only reference I can find. I will look for additional information.

The second day of the new year was the day of the great wrestling match between Okonkwo's village and their neighbors. It was difficult to say which the people enjoyed more the feasting and fellowship of the first day or the wrestling contest of the second. But there was one woman who had no doubt whatever in her mind. She was Okonkwo's second wife, Ekwefi, whom he nearly shot.