Is there any instance of a hero who, after having killed his enemy, rues having had to do so?

I'm looking for a specific instance from epic literature (but willing to accept answers from outside that genre) of a warrior who doesn't rejoice over his defeated foe nor drag him around the city walls. Instead, he says something along the lines to his dead foe:

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> I admire your spirit and you were a fine warrior. It is a sad destiny that led you to find me on the battlefield. You could have prevailed against a lesser man, but of course I'm the greatest. I am sad for you and your family that such an otherwise fine warrior would be cursed to come across me.
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Basically, I'm searching for an example of a warrior who is the best at what he does but has a certain tragic view of life that leads him to honor his foes, even though he defeated them fairly.