Jaden was amazed by the skill that this person that he had just killed possessed. Maybe it was not skill, but patients. After all, while the others had been moving around slightly, he had been in the same position for quite a while without moving at all.
Since he was not moving, and his breathing was regulated, Jaden was not able to tell that he was there. And that was the reason why he was able to attack the moment that Jaden went through the door.
It was just that Jaden's reaction speed was extremely high. Additionally, the moment that he began making a move, Jaden who was already cautious immediately noticed him, managing to dodge.
As for the attack that he had launched, even though it did not use his full strength, it consisted of almost half of his strength. That was the reason why Jaden did not doubt that he had already killed the other party.