Well it's not like she was swinging the katana in many different directions swiftly; the parry plus slash was done in one direction, so she swung the katana once. Then she distanced herself away from the man to regain some balance, because yes, it is quite heavy, but not so. Sure, without the katanas, the man would easily beat her up, but in this case he charged with one, which she parried. And she did sidestep/dodge first before parrying, like I said above. 

Nevertheless, I've changed it to 12. And yes, the man isn't a trained soldier. Just some vengeful dude blinded by rage.