Jun Moxie would only need to twist his wrist to kill Xiao Buyu under these circumstances. But, the Young Master Jun felt that he would be condemned in history if he allowed this beast to get away with a clean and easy death!
Therefore, it was important that Xiao Buyu's death be remembered in the name of infamy. It was important that he left behind eternal ridicule to his name. In fact, it was necessary that this infamy wouldn't even allow his spirit to rest in peace after he had died and became a ghost… even the sight of his ghost should bring laughter to the heart of people!
It would be fine it others didn't get to see this. However, Jun Moxie would still feel that he had done his best.
After all, an evil man must die an evil death.
Therefore, Jun Moxie persevered even though he felt tired.