However, this sharpness is only demonstrated by cutting with the optimal angle, so, setting aside testing sharpness by bringing Katana down to a body at rest, it is virtually impossible to cut always with the optimal angle against someone moving around in an actual fight.
尤も、この切れ味は最適な角度で切り込んでこそ発揮できるもので、静止物に刀を振り下ろす試し斬りならともかく、実戦で動き回る相手に対し常に最適の角度で切り込むのは至難の業である。