Flying sword sword shock wave series

When you enter the intermediate stage of flying sword, you can freely inject qi into the sword. At this time, you can learn the essence of flying sword-firm but gentle. On the basis of summarizing the primary swordsmanship, the firm but gentle will explode the gas injected into the sword and annihilate the enemy remotely. If the sword used at this time is not tough, it may break because it can't stand the shock wave.