How does a captive/captor relationship become a guest/host relationship in the Guest?

I love this story. Writing about it is really a pleasure.
This story is filled with irony and paradox. From a French point of view, Daru must take
an Arab prisoner to French prison. From an Algerian point of view, Daru is an outsider
taking a countryman to an outsider's jail. Poor Daru is caught between this. Although
Daru loathes the violence that this Arab has purportedly inflicted, he loathes (perhaps
more) the thought of himself as an extension of imperial France. Daru decides to treat
the Arab as a guest. In a very simple and touching scene, Daru shares a modest dinner
with the Arab. Very little is said but they eat together; it is a communion between host
and guest in a land that is disputed by their respective countries. Thus the obvious
question becomes, who is the host and who is the guest? Daru feels exiled everywhere
else but Algeria but at least Daru has a name. The Arab in this story remains a nameless
prisoner under an occupier’s law. We can debate who might be the host and who might be
the guest but Camus makes it clear that these are simply two men caught in a world that
refuses to let them be brothers.