User blog comment:Kevo411/More Hunter x Hunter Questions/@comment-25104495-20140916165535

To answer thr questions breifly I would say:

1. For this one, Killua kept feeling this pain coming from the tip of his head. Also he lept seeing Illumi inside his head, so the only thing he could do was go for the source of pain, and so found the needle.

2. I don't they killed them all did they? I mean the Numere wetlands are inhabitated by these creatures so you would expect them to mate and survive.

3. I would say that Togashi may have disregared nen in that fight because nen was not introduced yet. If it were to be mentioned after nen was introdced I think it would have included more details regardign this question.

4. I think mainly because no one was paying attention to what he was saying, as they were busing watching kurapika's rage. Or they might as well haven't heard him.

5. It's called The Snake Awakens. It is mainly fighting technique, just like Rhythm Echo, and I believe killua prefers to rely on his nen abilities in battle.

6. He tries to use it when applicable. He wouldn't throw all his cards if he believes they wouldn't work.