The martial levels here were more difficult to attain than anything he had encountered before!
No matter how gifted one was or what divine tricks one had, it was pure unadulterated wishful thinking to want to kill someone of another level.
Take Yun Yang's battle for example – he had been equipped with a marvelous weapon and the skill to execute a phantom-like ambush, but he had to play attrition with all that he had in order to exhaust his opponent; ultimately, Fatty had to steel himself to deal the ultimate blow before the both of them could wipe out a fourth-level Honor.
The ache and despair could hardly be understood unless one was involved in the exercise!