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There are Mr. A and Mr. B. They are conjoined twins who each has their own set
of organs except for the heart. I write the name of Mr. A while imagining his
face, with the cause of death being falling from the top of Tokyo Tower head
first. Let's say the difference in height between the two is less than 1 cm.
Will Mr. B also die?

According to [**How to Use:
XXVI**](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XXVI),
item 2:

> Even though only one name is written in the Death Note, if it influences and
> causes other humans that are not written in it to die, the victim's cause of
> death will be a **heart attack**.

However, a heart attack will also kill Mr. B.

Additionally, [**How to Use:
X**](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_X),
item 2 stated:

> Whether the cause of the individual's death is either a suicide or accident,
> if the death leads to the death of more than the intended, the person will
> simply die of a heart attack. **This is to ensure that other lives are not
> influenced**.

* * *

This question is a bit different than [the one proposed as possible
duplicate](https://anime.stackexchange.com/questions/7415/can-writing-in-the-
death-note-influence-others). In the proposed question, the death of the pilot
or the surgeon doesn't necessarily means that the people in the plane or the
one in the surgery will 100% die. There is a delay before they actually die.
Surgery is rarely done by only one doctor. It usually is done by a team of
doctors, so the other doctors can still save the patient. Flying a plane is
also the same. There is also the co-pilot. In the case of my question, killing
Mr. A is the same as killing Mr. B since they share the same heart with no
delay whatsoever to save Mr. B.


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death-note
Killing Conjoined Twins using Death Note


> Even though only one name is written in the Death Note, if it influences and
> causes other humans that are not written in it to die, the victim's cause of
> death will be a heart attack.

Does rule XXVI not answer your question? Mathematically speaking you could
rewrite it as follows.

> Causes others to die => (Cause = Heart-attack).

Here you could see that the heart attack would be **logically implied** as the
cause of death if others are influenced, regardless whether they take others
with them. Therefore **they would both die**. Mr. B would also be killed.
Remember that this rule does not say that if you would cause another human to
die, that you would stay alive. It only says that the cause changes to a heart
attack, which in this case would kill both, so the death of the other would be
unavoidable in this case.

If this would not have been true, **Light would have been able to make himself
completely immune to the Death Note, even making it impossible for Ryuk to
kill him**. Light could have implanted a bomb inside a few people, that would
all be triggered when either his heart or their heart stopped beating. He
would repeat this over different groups of people. By doing so, Ryuk would be
rendered unable to kill Light as it would be impossible to kill any of those
with a bomb implanted, as it would kill the others and he would not be able to
kill Light as it would kill all of them. This would make Light immune to the
Death Note, which I found very unlikely to be true, because **it would
completely contradict the first and most fundamental rule of the Death Note**
namely

> The human whose name is written in this note shall die.


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answer


Although Peter Raeves has given quite [a good explanation as to why they will
simply both die](https://anime.stackexchange.com/a/21877/1398), there is also
the possibility that rule XXVI **does** imply that no other people will die
because of the person's death. In practice, this would be a hard rule to
follow (pilots dying whilst flying, doctors dying whilst operating, a
conjoined twin...), but for the world of fiction, it of course wouldn't.

You can always think of a scenario where no other people will die. The bomb
scenario in Peter's answer, for example, can be debunked with simple
technology malfunction. Every time Ryuk writes down a name, there is the
extreme coincidence that the bomb on that person disables for what seems to be
no reason.

For the conjoined twins, they can have a heart attack, yes. However, you can
be _revived_ after this. So people try to revive them both, but only Mr. B
gets to survive, and the other dies.

Every thinkable scenario can be debunked in the world of fiction :)


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