Rudy stood in front of the mirror and stared at his reflection. Then, he opened his fist that he had closed before leaving for the washroom.
The blackness that was only on his fingertips had now spread and covered his finger with it. He could no longer hide it and thus, as soon as he noticed it had spread, he closed his fist to avoid getting it seen by the girls.
"Now I know how and why it spreads. But is my theory right?" he wondered.
'I know the exact moment it spread. It was when I was dead serious about killing the non-humans staying in this world.'
Rudy once again looked at his black fingers and mumbled, "It responds to my negative emotions and thoughts. In short, any negative feelings I experience… results in this… increasing.
However, if that's true, should it not decrease when I feel positive emotions?" He asked himself.