Try doing that with a 4" bushcraft knife.
What I found most impressive, was how he sheaths his blade, without looking! I like how he keeps stripping or cleaning.
The Samurai would carry smaller knives as well. This is a Katana , the next one down is a Wakisaki followed, by the Tanto. They often carried little daggers aswell.
The environment dictated their use, you don't use a long sword indoors, nor a dagger for firecraft. Like the leaku/pukko combo.
Really enjoyed that thanks for posting it.