How could Obito transport his body parts in another dimension without bleeding?


I have a question that's been bothering me for a while. I know that Naruto is
supposed to be a manga written for teens and pre-teens so some stuff doesn't
have any explanation or represents a plothole, but still I would really like
to know whether this question has a reasonable answer or not. How can Obito
transport his body parts in another dimension without the person that passes
through him getting blood over his/her entire body? And why doesn't the body
just collapse with the head being in another dimension?




Obito uses a technique called [Kamui](http://naruto.wikia.com/wiki/Kamui).

> Kamui is a powerful [Mangekyō
> Sharingan](http://naruto.wikia.com/wiki/Mangeky%C5%8D_Sharingan) dōjutsu
> that creates a unique and specialised form of [space–time
> ninjutsu](http://naruto.wikia.com/wiki/Space%E2%80%93time_ninjutsu). It
> allows the user to achieve two very distinct, yet closely associated feats —
> teleportation and **intangibility**.

Intangibility, here refers to making the body or certain parts of body
inaccessible to the physical world. Thus, no one could touch him and passed
right thought Obito.




Obito uses a technique called [Kamui](http://naruto.wikia.com/wiki/Kamui).

> Kamui is a powerful [Mangekyō
> Sharingan](http://naruto.wikia.com/wiki/Mangeky%C5%8D_Sharingan) dōjutsu
> that creates a unique and specialised form of [space–time
> ninjutsu](http://naruto.wikia.com/wiki/Space%E2%80%93time_ninjutsu). It
> allows the user to achieve two very distinct, yet closely associated feats —
> teleportation and **intangibility**.

Intangibility, here refers to making the body or certain parts of body
inaccessible to the physical world. Thus, no one could touch him and passed
right thought Obito.

