The Praying Mantis did not give Ku Wai any quarters. It executed its swings precision and power. While the shield did reduce Ku Wai's mobility, he was thankful that he had brought it out to fight against this monster. He had made some careless miscalculations regarding the monster, which nearly cost him his arms if it were not for the shields blocking the attacks for him.
However, Ku Wai could see that the shield would not be able to last if the Praying Mantis continued being relentless in its attacks. As much of a musclehead he was, he too read the reports on Jin's dungeons.
And from the reports, he concluded with one statement… they were difficult. It was not just because they were story-based but the monsters Jin created through dimensional technology was tip top. Upon fighting against this particular praying mantis, which was definitely not the boss, he could already see that Jin's skill in creating monsters was superior to the dungeon suppliers the Royal Zodiacs contracted.