from my understanding...
it was a split kick and a block low, to a slash up...(typical broadsword pattern)
practiced three times in a row... the purpose -- stamina, repitition for familiarity, and traditional forms have 3 repetitve sequences in some cases. WL foms have 3 sequences in a lot of there forms, so... no surprise there....
from what i was taught (and i can actually fight with any long/short/flexible weapon in combat scenarion, being i learned how to fight full contact with weapons...(learned with armor and with out -- which hurts ) it was a jumping block against a spear defense -- by jumping forward and pressing the spear down... you gain ground on the spear fighter... when you land, you can lock the spear with your legs long enough to strike the spear fighter with your broadsword.... hence the upward slash
cutting off heads and all that is rubbish... it sounds good in mystical stories but MC makes more sense than that.... the lao wai couldn't do it so he had to dumb it down...
give the man a little more credit than that...
-zz-