I think it likely didn't pain him before because in the past, whenever the thing told him to run, he just did it.
This is the first time he REALLY tried to fight it. So when it tried to make him run, and he didn't, it started to cause him pain.
I think it likely didn't pain him before because in the past, whenever the thing told him to run, he just did it.
This is the first time he REALLY tried to fight it. So when it tried to make him run, and he didn't, it started to cause him pain.
It has to do with strength instead of willpower though. The headache came about becase Killua refused to run. If we're talking about strength, he already had the body-piercing ability back in the Hunter Exam.
Given that the pin was put in place to preserve Killua's life (and to win via relative strength), I'd say that it was never intended to be removed.
If it's not Isuzu-chan Mii~