Hi Len - Quite an opponent you have dreamed up.
Two ideas or images come to mind. The first is that the blood on the Samurai blood is very similar to being blood brothers in another culture. Also I have come across another 'dream' in which a conflict went on forever without resolving - as yours promised to do - and in that one the dreamer realised there could be no resolution to this and gave up by throwing down his sword. The result was a wonderfully change in the dreamer. In fact a new life.
Also you cannot be killed in a dream. All you can experience is the anguish and perhaps fear of dying, but in dreams you cannot die - or drown, or burn or any other threatening thing. We make the mistake of taking our very real values from our outer life into our inner life of dreams. So it will do you no harm to throw down your sword and challenge your opponent to do his worst. That is a very powerful thing to do. Or you could realise that actually a dream is a very real virtual reality all created by your feelings, thoughts and fears, and so you could see your opponent as an exteriorisation of yourself and draw him back into you and gain his power.
Anyway, what an amazing dream. No fear or running - just watching and reacting.
As far as interpreting the dream - I feel you have been influenced by Japanese culture, and in the Samurai opponent you are meeting your more daring and strong self. What will you do with all the fire and power? There is something about family here to, as swords can be passed down through many generations. So ask yourself what is passing down to you.
Tony