Perfect Solution

This occurred because the bones of the fist were weaker than the bones of the region being struck. Thus, the attacker suffered all the damage of their own attack.

It was no different from trying to damage a steel wall with glass. It didn't matter if the glass attacked the wall, it would always be the one to suffer.

Normally, this happened at random and was unpredictable.

However, what if someone devised a system of thought that calculated how to make this happen every time?

What if someone created a system of thought that evaluated the structural integrity of their opponent and adaptively evolved their movements to ensure each collision damaged their opponent more?

'In that case, it doesn't matter how powerful my blows are," he narrowed his eyes. 'She will always be immune to them.'