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As the battle progressed, Shin was able to adjust and familiarize himself with his new battle style. And as he faced more waves of monsters from this horde, he was able to adapt to this style with a great speed all the way until he was already proficient enough to wield this style as well as his other battle style.
And even if he preferred using his other battle style where he could do a lot of variations of skill combinations, he could somewhat see that his current battle was more suited to the current him.
If he really combined the Assassination Methods that he learned from the Black Serpent Mafia Training Ground, and the Fatal Techniques that he got from the Military Discipline, together with the Martial-Arts and Swordsmanship that was thought to him by the Old Monster named Plum, then he would most probably get a style that was similar to the one that he was currently using.
