How does Killua know about the Dragon Dive?

[Future Warrior]

He wasn't able to see Nen before but he still somehow recognized it. I'm thinking plot hole.

 

[Papasmurf]

Either Zeno told Killua and the rest of his family that his attack takes the shape of a dragon, or it's just Togashi's lack of foresight.

 

[Future Warrior]

Do the arrows look like dragons though? I'm pretty sure Killua didn't see the actual dragon and was able to know that the multiple attacks came from Zeno.

 

[Papasmurf]

Killua and his grandfather have the same Nen type, so maybe Killua called his family for advice when trying to develop a Hatsu at the beginning of the GI arc? That's the only excuse I can make for this when Killua never met his grandfather after the Killua's Mansion arc and he didn't even have Nen back then.

 

[Pocket-Gog~]

Killua has a short memory, its the same reason why he called Gon his first "friend", but secretly always was friends with his younger brother.

 

[Captain Cadaver]

Without just labelling it as a plot hole, it could just be assumed it's one of the few Nen abilities that's an exception to the rule and that non-Nen users can see it. For example, Kurapika's chains made through Conjuration seem visible even to regular people as some of the fodder in the mafia could still see them and their purpose was to fool the Troupe into thinking he was a Manipulator. If assuming Zeno's Dragon Dive is just as visible, it's not hard to imagine Killua having seen it at some point.

That's not to say there aren't a few elements that are at best complete contrivances and at worst large plot holes that come from Killua having been kept in the dark for so long or Nen being on such a need to know basis, such as the fact that even his family's attendants are Nen users (eg. Gotoh) or capable of fighting them (eg. Canary) or the Nen users at Heaven's Arena all performing in front of a huge crowd of spectators from the 200th floor onwards (which, even assuming they're made up entirely of the elite and Nen users, is still very questionable).

 

[Future Warrior]

Seems like a hard reach for him to instantly assume it was his grandad's ability based on a description he gave him on his attack through a phone. It's possible, but it requires suspension of disbelief.

 

[Papasmurf]

Seems like a hard reach for him to instantly assume it was his grandad's ability based on a description he gave him on his attack through a phone. It's possible, but it requires suspension of disbelief.

Maybe Zeno recorded himself using the attack and forwarded it to Killua's phone

Again, this is why most people consider it poor writing. There's no foolproof explanation for it at all.

 

[Future Warrior]

Without just labelling it as a plot hole, it could just be assumed it's one of the few Nen abilities that's an exception to the rule and that non-Nen users can see it. For example, Kurapika's chains made through Conjuration seem visible even to regular people as some of the fodder in the mafia could still see them and their purpose was to fool the Troupe into thinking he was a Manipulator.

Conjured items are the only exception to the rule, since it becomes an actual physical object at that point. They could even add aura onto it with Shu. Zeno's attack is pure aura.

or the Nen users at Heaven's Arena all performing in front of a huge crowd of spectators from the 200th floor onwards (which, even assuming they're made up entirely of the elite and Nen users, is still very questionable).

Well there's no reason to believe that the spectators are aware of such abilities. I think it was explained that Nen users are seen as geniuses by the general public.

 

[Captain Cadaver]

Well there's no reason to believe that the spectators are aware of such abilities. I think it was explained that Nen users are seen as geniuses by the general public.

Seems like a major stretch that the average spectator would assume a guy controlling multiple spinning tops as deadly projectiles could be chalked up to being a genius.

 

[Future Warrior]

Well there's no reason to believe that the spectators are aware of such abilities. I think it was explained that Nen users are seen as geniuses by the general public.

Seems like a major stretch that the average spectator would assume a guy controlling multiple spinning tops as deadly projectiles could be chalked up to being a genius.

Why not? I'm not using the term genius in terms of IQ obviously.

According to the wiki...

These individuals are typically known as "geniuses", "psychics", or "superhumans" to the public. This can be anything from inadvertently being able to use the basic techniques of Nen[8] or unconsciously developing a unique Nen ability that can be used without really understanding how or why one is able to do so.

It's like the real world equivalent of someone being able to inexplicably make a piece of paper burst in flames from their own hands and people assume he was given powers by Jesus.