To successfully perform a passive block as suggested would require strength, but it isn't impossible. An experienced swordsman will also yield to a degree, extending the time taken to halt the momentum of the attack thus taking some of the sting out of the blow, reducing the chance of a broken blade or causing the sword to slip.
It was generally prefered to block with the lower part of the sword, which is often thicker & thus stronger, reducing the chance of a blade snapping, plus also avoiding damage to the egde of the blade closer to the point, ie. the part most likely to be used to strike an offensive blow.
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