Premise:
"You think so, Hastings?"
Hypothesis: You reckon, Hastings?

yes

Premise:
"How dared he think that he had discovered what so many wiser and clever men had overlooked? "
Hypothesis: Was what he found actually of some use?

it is not possible to tell

Premise:
"'You killed Derry.' I repeated it, because I felt a terrible shame for almost forgetting her."
Hypothesis: Derry did not deserve to die.
it is not possible to tell