The yelling thing seems weird but It's actually pretty accurate for samurai to yell before attacking (for a few reasons: allows for greater exertion during thrust due to rapid expulsion of air from lungs, "paralyzing" (or startling/stunning/confusing) effect on target, expresses confidence in their victory, etc…) It's known as "Kiai" in Japanese martial arts.
This man just said what boat.
The yelling thing seems weird but It's actually pretty accurate for samurai to yell before attacking (for a few reasons: allows for greater exertion during thrust due to rapid expulsion of air from lungs, "paralyzing" (or startling/stunning/confusing) effect on target, expresses confidence in their victory, etc…) It's known as "Kiai" in Japanese martial arts.