Thanks for sharing this video. I love the whole 'spirit' of their competitive interactions, and the music added a festive, playful vibe to the gathering. Very cool!
From a more technical perspective, it appears to be a skill which is learned through the regular experience of wrestling from an early age, more than through formal instruction on how to practice and apply it.
As a result, many attempts were made to execute good techniques from beyond their most effective range of applications, and superior size and/or strength decided numerous matches, rather than refined technical expertise. Correcting those errors alone would vastly enhance the personal combat efficiency of all the techniques.