Explanation:
the protagonist is is important because he's the one who drives the plot forward although evens and circuit amses happen to characters it's the characters response that defines what happen in your story here protagonist witnesses the murder of his parent as a child
Start a fire. It sets the entire island on fire and puts them in danger. As far as irony goes, fire is a symbol of hope in the novel, so it is ironic that hope is the thing that would destroy them (if they were not found just in time).