She did this with a metal weapon. If you are naturally athletic and use a metal weapon on any human you can completely annihilate a person's face in a few moments.
Hitting someone in the face with a hammer and breaking their nose, or hitting someone in the face with a baseball bat and breaking their nose is not the same as hitting someone in the face with an ice cream scooper and breaking their nose.
While yes, all three of the aforementioned instruments are made of metal, the baseball bat and the hammer are both heavy and dense; they are wholly metal on the inside and the outside. When you swing a hammer or a bat, most of the energy being generated is from the thick, heavy, metal object in your hands and
not yourself; hence why a metal baseball bat performs better than one of those hollow, plastic ones kids play with, or why a steel hammer does the job better than a rubber mallet.
On the other hand, the ice cream scooper is both incredibly light — well, the entire knife is light — and is hollow, both of which are completely paramount to the properties of the previously mentioned instruments. Not only that, but unlike with a bat or a hammer, where you swing the instrument with your hands on the handle, thus reducing your influence over its force, Naoko is gripping the knife at the base of the scooper, so the force being generated to destroy Saki's nose is entirely hers, or at the very least majority of it is. She is directly influencing the strength of this scooper, so it would scale to her.
Well, yes, that is true. But you know, piercing damage via weapon.
Piercing damage and slashing damage are not the same. Even a child can end up breaking skin with relative ease by applying just the minimal amount of force to a sharp edge; razor blades, scissors,
paper, even soda cans can slice through someone with very little effort. In fact, there was one time where I was washing the dishes at home, and I was foolishly rubbing the edge of a stainless steel knife with a rag with as little force as possible, and the knife cut through the rag and into my thumb deep enough to where I needed sutures.
Completely paramount to this, though, is piercing damage, which requires far more force then slashing damage. When you pierce something, you actually destroy a sizable piece of the body in the process. Cutting someone with a knife, even if the slash is swallow, requires significantly less energy than is required to both break skin and then puncture the underlying tissue and muscles. In the case of piercing through bones, that requires even more energy, since bones are far more dense and durable than tissue and flesh.
My little brother once cut both my head and my arm open, on separate occasions, with a metal rod/pole despite being incredibly weak and just only managing to graze me, but it would be impossible for him to stab that same rod through my head, especially because the pole is flat, rather than sharp. You would need a significant amount of energy to jam a flat instrument through the human body, much more than would required to slash through it.
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