Fighting fair is all well and good when you know you can win, but why take that risk when you can fight dirty and guarantee it? Afterall it's a big universe out there and when it comes to fighting dirty there is no greater master.
So next time you are on the receiving end of an "unfair" fight ask yourself, what could I have done and how could I play the universe to be the one with advantage?
And when you get the opportunity to kill your foe be ruthless and efficient and already prepared to take your next target. The universe is a dangerous place, living by a code of honour will just get you killed and no one will care that you died living to a set of rules.