Between lines 9-19 we can see that the boatswain has little tolerance for passengers and wants them to be away from their place of work. This is evident when he continues to send passengers back to their cabins and further states that that ship does not carry anyone he loves more than himself.
We can deduce that Alonso, Antonio and Gonzalo are men of great courage, since they do not repress themselves with the boatswain's attitudes, do not fear death by drowning (although they would rather die on dry land) and are very loyal to their king, since they decide continue with him in that moment of eminent death.
They are techniques used to build logical support for an argument. They make nonfiction writing more entertaining. They are rhetorical devices used for persuasive effect
