

In the battle against Raikage, Sasuke cast Amaterasu and Raikage avoided it
pretty easily because he's fast.  
In the battle against Kaguya, Sasuke cast Amaterasu and it hit her.

**Question**  
Was it because:  
\- Sasuke Amaterasu speed had increased as he grew stronger so Kaguya couldn't
dodge?  
\- Kaguya could dodge it but she simply took it because she knew it was a
chakra that she could absorb?

Are there any information about this?

Note: Kaguya is faster than Raikage, right?


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naruto
Can Amaterasu's speed increase?


_**Short Answer**_ : [Kaguya
Otsutsuki](http://naruto.wikia.com/wiki/Kaguya_%C5%8Ctsutsuki) was very
powerful but her speed was just slightly above average. During her
[battle](https://www.youtube.com/watch?v=reSSnNOGX5g) with Sasuke and Naruto,
all she mainly did was hop from dimension to dimension, use a bunch of [Kekkai
Moras ](http://naruto.wikia.com/wiki/Kekkei_M%C5%8Dra) and absorb their
attacks with her Rinnengan. **Note that she is NOT faster than Raikage Ai when
he uses the Lightning release chakra Mode** to enhance his speed and reaction
time. The only reason why Raikage could dodge it is cause he combined 2 Jutsus
simultenously in order to detect and flicker away from the flames. Kaguya on
the other hand, was not fast enough to dodge the flames. However, she was
skilled enough to quickly absorb them before they did enough damage on her.

So to answer your question, the speed of Amaterasu was never increased, She
just was not fast enough to dodge the flames like Raikage did.

_**Super Long explanation:**_

The Amaterasu is a very fast jutsu in terms of how long it takes before it is
cast. Unlike other jutsu, all it requires is that you see the person you want
to hit and then [Black Flames](http://naruto.wikia.com/wiki/Amaterasu) are
ignited at the focal point of the target! This means that as long as the user
can see you, the Amaterasu is most likely going to hit. In order to dodge an
**" accurately-aimed" Amaterasu**, I believe the persons speed must be pretty
close to that of light because the focal point of vision is directly what your
eyes see from the refraction of light. (Its a completely different scenario if
the user is partially blind and can't aim well.) [![Check the Shu guys
comment](https://i.stack.imgur.com/WVKXy.jpg)](https://i.stack.imgur.com/WVKXy.jpg)

In the case of Raikage, he used 2 jutsu's simultaneously in order to dodge
sasukes Amaterasu. The first one is the lightning release chakra mode. During
his battle with Sasuke, Raikage was wraped in lightning during the entire
fight and once sasuke started to use the mangekyou Sharingan, Raikage
instinctively started using way more chakra for the [Lightning Release Chakra
Mode](http://naruto.wikia.com/wiki/Lightning_Release_Chakra_Mode) in order to
increase his already heightened speed and reaction time.

[![Lightning mode body
flicker](https://i.stack.imgur.com/CySI5.jpg)](https://i.stack.imgur.com/CySI5.jpg)

With enhanced speed and reaction time, Raikage was able to immediately react
to sasuke's amaterasu, he then used the ShunShin no jutsu ( Lightning release
[Body Flicker technique](http://naruto.wikia.com/wiki/Body_Flicker_Technique)
). Since he combined the 2 jutsus perfectly, he was able to instantly react to
and swiftly move away from the flames ( _ **all within a matter of seconds,
simply mindblowing lol**_ ). Moreover, Kaguya could not pull such a feat.


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Speed is just a vague concept while using Amaterasu.

The real answer to this is accuracy. While fighting Sasuke, Itachi missed the
Amaterasu several times. Not because Sasuke was running at the speed of light,
but because of his blurry vision, which could not target Sasuke properly.

It could be that Sasuke missed casting it on the Raikage because he wasn't as
proficient with it as he was while fighting Kaguya. His visual prowess was
also enhanced and his vision was clearer because of the Eternal Mangekyou
Sharingan while fighting Kaguya.

So, the speed of the jutsu could increase (time taken to cast the jutsu, not
reach the object) after unlocking the Eternal Mangekyou Sharingan.


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