Is the barber a coward? Why he did not want to kill the captain?I need at least 6 paragraphs.

I can't get you six paragraphs, but you could write quite
a lot about the dilemma that the barber faces.  As a revolutionary, the general lying
under his knife presents quite an opportunity, one that would bring him great glory in
the movement if he were to take advantage of it and spill his blood.  It wouldn't take
much, just a little extra pressure with the blade...

But it
also presents a moral dilemma for him.  If he murders the general, what then seperates
him from the monster that he believes the general to be?  Is there any honor to be found
in killing a man in cold blood (essentially) while he sits defenseless in front of
you?

Of course the admission on the part of the general
that he came to see if he would actually be capable of committing murder puts the barber
back into the cowardly light perhaps, but may also just serve to emphasize the
difference between the general and the barber.