I have no any intent to claim anything.
Ancient Rome banned fights with fists in 393 AD because considered them too brutal....
Egypet and Sumerian relief was with equal obstacles; if your legs are deeply in sand, you cannot kick enough fast. And there conclusion, why they used fists not legs.
About transmited skills, why not?
If hands position in Minoan culture fresco were like in barehands fighting 3500 years later, then...
How to hold hands and punch in ancient times how might be skills transfered to others?
Two mans fight. Others see it and before they try to fight, they decide, what methods worked in this " bout " and are trying to do what? Things they already saw that were most effective... That's the method of " skills transfer ".
The same skills transfer about any tools usage in ancient society. Majority of them then didn't knew how to write papers and didn't had them. Looks, see what methods works and repeat what? The most effective methods they had seen. In this manner any skills were polished and transfered trough generations in ancient society. Of course, if elders taught youngsters they taught what they knew, this also helped to polish any skills. For example how to make hammer, how better to use it etc.