Make a decision about what your role-playing character is going to do when you encounter a swords woman in an open field.
I would need more background information to decide what to do like why I was there, where I was going and what the people in the locality were like. If this is just a random encounter then I would simply show myself unafraid and explain that I was just admiring her skill and if she could show me directions to wherever it is that I am going.