When absorbing the Nest Crystal, Quinn knew that his body was going through an evolution. Although it stated that his system was getting an upgrade, it felt more like he was the one that was changing. However, becoming the celestial vampire made him realise that he and the system were more linked than before. It was as if their body was one.
Quinn always used to see the system as something helpful, a tutorial almost of how to become a vampire. Vincent had even explained it to be that way. Now though, it had evolved into something else.
At the time of the great fight, Quinn was just making what came to him and his mind naturally, which allowed him to take out Graham. Because of it, he had drawn far too much power for his new body to handle, and it had made him end up in the current situation he was in now. Whatever the reason, he didn't want to do that now, so he needed to read everything carefully.
[Celestial Vampire System]
[Level 1]