Surely such a great swordsman would rather just cut down morley with his sword especially if he is worried about collateral damage. Sword would be much better option than that inefficient broccoli form against a giant.
1-Set in the end of 19th century, where the Meiji Restoration just started, the hero, Aramaki Gennai (Karasawa Toshiaki) does not act so much like a "hero". He's a drunkard ronin (masterless samurai) who loves to lazy around in the house all day, and depend on his girlfriend for money. He doesn't care at all about anything or what happen in the world. Rumours has it that he has an unbelievably excellent skill of swordplay, but no one has ever seen him demonstrating it.