Never mind fencing, blocking, parrying or anything else you've seen in pirate or gladiator movies. The katana is a two and a half -foot long single-edged blade with a sharpness exceeded only by modern surgical scapels.
Think about what that means as a weapon: a quarter-inch thick, 28" long razor blade with a two-handed grip. I found a virtual warehouse of videos on youtube demonstrating katana shredding bamboo mats, piercing folding chairs and actually splitting handgun bullets.
Wow.
Got me to wondering if anything on earth could possibly be sharper ... or strike with more definitive and conclusive results.
Then I remembered scripture.
For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.
- Hebrews 4:12