You are dreaming. Within your dream you saw a man that looks just like you. Except that he looks older, wiser, dresses in full armor, no helmet & wielding a kendo stick. It was not until that he turns to you & draws his weapon that you realize you too are wearing the same thing as him. He strikes on your left. You blocked it, not out of reflex but as if you know he is going to strike there. Both of you continue to fight for length, each exchanging blows but failed to injure each other. The other you doesn't seem to be hostile. It's as if he's... educating you.
Out of curiosity, you dig through the family tree, and discover that man happen to be your ancestor, a well accomplished general.
This has happened more than once.