In Gu Long's novel, Hoodlum did not have internal energy, but he had a special skill and technique called "Sword Aura". This sword aura could be cultivated through continuous practice and training to give the user great speed and strength. Hoodlum's sword aura was not only fast, but it could also instantly hit the enemy's weakness and cause huge damage. In addition, he could dodge enemy attacks by moving quickly and using the surrounding environment to create traps and obstacles to better protect himself and others. Hoodlum's sword aura was closely related to his martial arts skills. It was the result of his talent and hard work, and it was also one of the important reasons why he could become a top expert.