Re: Would you teach this knife technique?
if riai is the name of the game, it is just a matter of perspective.
Imagining that the forearm is the sword is part of the issue. That visualization would work fine if toy were striking someone. But if you are trying to go empty hand against a knife. Thus forearm should remain your forearm, hour hand remains a control tool (a grip on the imaginary sword). The opponent's arm becomes the sword. This visualization maintains Munenori's mechanics and improves leverage.
Of course, I notice you keep your elbows close while wielding your knife. You know the drill.....