One opinion says that hunting was invented by the people who lived
back at the beginning of people. I think it goes back even farther than
that.
Every living thing that can move around goes hunting for things to eat,
and there were a huge number of living things that could move around,
long before people came along. Like dinosaurs, bats, cockroaches etc.
So I don't think you can say that hunting was ever invented. It was just
something that living things just naturally always did, like breathing.
The author uses imagery from the poem to create a mood that shows a form of delight and glee.
The development, the happening, the incident, the occurrence, the situation. The affair, the encounter, the meeting, the moment. the episode, the problem and solution. Others have mentioned these or their ilk: the chapter, the passage, the story, the period, the attack, the bout, the installment, the phase.
The answer for this would be the first one , to inform