Inazuma's coolest, creepiest moment, to be sure.

She finally found a way to make men listen to her

One of my all-time favorite issues of any comic. I've read it many times, and I still get giddy on that first page when those thugs masquerading as peasants turn simultaneously to look at Inazuma. The whole story is a terrific example of characterization blended with action. Look at Inazuma's face when when she's killing those guys and their eight friends. Usagi or Gen or Tomoe would be gritting their teeth and yelling "Ryaaaaa!", but she never changes expression or utters a sound.

Then there's her origin story where she loses her family and then her husband who, even though he was worse than useless, was all she had. After, and even during, the orgy of violence in the gambling house, she's almost emotionless. Despite the mention of not sharing the same sky as the killer of your lord, I'm not even sure her motive was vengeance as much as punishing those who had caused her to be alone.

You can argue that she did wait for Usagi before telling her story and it was for his benefit--after all, she seems to have begun it just as he showed up--but I prefer to believe like thwhtguardian, that she was going to regale a room of dead men with the tale, and Usagi just happened upon it. That's creepier and shows how detached from the world she has become.

Great stuff. I understand that her character arc was most likely to end in tragedy, but I'm really sorry there won't be any more Inazuma stories than what we have.

I don't know Shax, the unconventionality of her skills could be the dominant factor of her wins. I know for a fact about this as my 1st year in college a friend convinced me to sign up for a fencing class. Now i have never had any sword training at that point excepting for my love of Errol Flynn movies and sword and sorcery movies. all through my childhood years and into my teen you could find me with an old fencing foil i bought from a Goodwill in hand fighting my shadow and thwarting imaginary villains. Once into the class and learning a few basics as we would practice i began to frustrate the other "professional" students who had either had classes or training as my responses and moves were considered not practical and correct. I was fencing in the Bruce Lee style of martial arts: i took whatever i had seen or watched or read about and fenced instinctively which drove the instructor and other students insanely crazy. I was doing this for fun, they for sports and the two did not work out well. I could win many and come out even more often than not and seldom did anyone ever have a total win over me. So there is something to think over about being self taught, especially in a time when that meant if you lost you usually died. Very quickly you would learn what works and what doesn't!
En Guarde!

It can also be said that it is not unbelievable Katsuichi win the 1st sword fight based on her unknown skill set and even that she might be able to overcome Ussagi, but after that initial confrontation and each succeeding battle Usagi will take the measure of her skills until she is losing more often than winning.  

The classic "Spaghetti Westerns" were based upon popular Samurai films and, in some cases, were almost direct translations. Stan Sakai grew up watching those samurai films, so while the similarity between Westerns and some Usagi stories isn't directly intended, they're drawing from the same source material.