...…
Bang! Bang!
Boom!
As Shin was observing Haowin and trying to figure out what kind of hidden combat system mechanic the latter was using, his opponent was also doing the same.
Haowin discovered this hidden combat mechanic after he became a True Demon.
The clues that he had during that time were the rewards meant for the first player to come in contact with the Devildom and Underworld, so it was impossible for other players to also unlock it without him knowing.
At first, he thought that Shin also possessed a 'Perfect Demonification', since their battle capabilities were really on the same level. However, after observing his opponent for quite some time, he discovered that there was something different from the hidden combat mechanics that they had.