although Daniel has touched on it, I feel that the way in that this kukri was used is abuse. When you have a blade and handle weighing 2lbs and you embed it into a piece of wood weighing two or three pounds, you now have 4 to 5 lbs of weight on a blade that was not designed for it. Slam that down on a hard surface and you will shear the weakest part of the blade at the cho. When you chop a piece of wood down the grain your strike the wood and cleave through it as the wood parts and the blade continues downwards. If the blade embeds in the wood, the smartest thing to do is to either remove the blade upwards and chop again, or use a piece of wood to strike the blade at the tip of the blade whilst holding the handle loosely. This doesn't put stress on the weakest part of the blade, the cho, but powers the edge through the wood.
Just my 2 cents CDN.