

Why can't Tobi attack while he is dodging an attack using his [Jikūkan
Ninjutsu](http://naruto.wikia.com/wiki/The_Secret_of_the_Space%E2%80%93Time_Ninjutsu)
?  

> what Tobi actually does is warp away the part of his body that was being
> attacked to the other dimension.

During the entire anime it is portrayed that Tobi cannot attack while using
Jikūkan Ninjutsu because his attacks will pass right through the target.  
  
[![enter image description
here](https://i.stack.imgur.com/ooMM3.jpg)](https://i.stack.imgur.com/ooMM3.jpg)  
But while Kakashi was in Tobi's space-time dimension, he managed to punch him,
thus indicating that Tobi wasn't intangible.  
Is there any explanation or any theory on this matter ?


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naruto
Space-Time ninjutsu of Tobi


A simple explanation would be that he does not have control over which parts
of his body is able to interact with the real world and which parts would
teleport to the dimension. When the jutsu is activated, it simply teleports
any part of his body (and the things in contact with his body at the moment of
activation) that comes in contact with another object. Otherwise he would have
to focus a lot on using this jutsu to be exact or he would just have to
teleport chunks of his body that he assumes will get hit.


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Tobi's Intangibility works by moving any part of his body that is in contact
with anything else into the Kamui Dimension. Regardless of weather it is
manual or automatic, when he has his intangibility active, his body is split
between the 2 dimensions, the main and Kamui dimensions. Between them, his
body is 100% tangible, however, almost no one can go into the Kamui dimension
and actually see the parts of his body moved there. Kakashi was in a position
to do so however at the time of the scene in the question. As shown, his torso
has been moved to the kamui dimention in order to become intangible to
Naruto's attack. Kakashi was easily able to attack it then, since it can't be
intangible in both dimensions at the same time. His body is never actually
intangible, it's just moved to a place where no one in the main dimension can
reach it.


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well what most of us are missing is that kakashi and tobi has the same eyes
i.e. Both eyes are Obito's so actually both of his eyes are connected to the
same time and space.Hence even when tobi uses his Space-time ninjutsu ,kakashi
uses his kamui(Same Space time justs) to travel that alternate time-space and
touch tobi or attack tobi


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**Is there any explanation or any theory on this matter?** Yes.

Kakashi discovers Obito's weakness, to which he explains how
[Obito's](http://naruto.wikia.com/wiki/Obito_Uchiha) space-time justu works in
the manga chapter 597, and utilizes it against him.

> Although Kakashi cannot use Kamui against Obito directly, he can use his own
> access to the other dimension to negate the advantages Obito makes use of:
> by teleporting attacks or allies to the other dimension at the same moment
> that Obito's body resides there for defence, he can be attacked successfully

Kakashi states that attacks "passing through" is Obito is incorrect - Obito
sends his body into a different dimension; where he is completely tangible.

Kakashi begins to understand how this justu works when he sends a kunai into
the other dimension using his own Kumai ability at the same moment Obito
teleports his head to dodge an attack from Naruto.

[![enter image description
here](https://i.stack.imgur.com/HYfgll.png)](https://i.stack.imgur.com/HYfgll.png)
[![enter image description
here](https://i.stack.imgur.com/EF6wjl.png)](https://i.stack.imgur.com/EF6wjl.png)
[![enter image description
here](https://i.stack.imgur.com/mdnDil.png)](https://i.stack.imgur.com/mdnDil.png)
[![enter image description
here](https://i.stack.imgur.com/wPIO3l.png)](https://i.stack.imgur.com/wPIO3l.png)
[![enter image description
here](https://i.stack.imgur.com/8ULbul.png)](https://i.stack.imgur.com/8ULbul.png)


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