Wy did sasuke awaken the mangekyo after killing itachi

[Sasukecursemark]

He didn't know the truth at that point so wasn't his best friend naruto?

 

[Jigson]

True friend or a loved one, that was it right?

 

[iSpeak the Truth]

Witnessing the death of someone close to him.

 

[HashiramaDescendant]

Because Itachi gave him the powah, I think. :|

 

[Sasukecursemark]

Witnessing the death of someone close to him.

I thought it was best friend?
And sasuke hated itachi at that point

 

[blue666666]

he did known that why in part 1 fight he didn't kill naruto he wanted to get the power up his own way

 

[Sea Of Thy Soul]

I think he only awakened it after listening to Obito's speech about the truth (clan/ Itachi).

 

[Punk Hazard]

He awakened the Mangekyou because his love for Itachi was reborn after hearing the truth,, and he felt grief after realizing that loved one had died.

 

[iSpeak the Truth]

I thought it was best friend?
And sasuke hated itachi at that point

He was still the closest person to him, other than Naruto. You can't just be in denial about someone being your brother.

 

[Meee]

he had his traumatic experience when he was told the truth about Itachi so he unlocked it then xd

 

[Liquid Snake]

because kishi messed up. he realized he f***ed up by sayin u need to kill ur best friend to get it then he realized he couldnt kill off the main character ( like dragonballz) so he gav sasuke a cheap way to get a power up

 

[Brooks]

I guess seeing as how Itachi is closer to him than anyone else including Naruto and you awake the MS when someone close to you dies then is very understandable as to why Sasuke awaken the MS after hearing the truth about Itachi.

 

[DragonXero]

No , he didn't awaken it till after he found out the truth

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Itachi just planted amaterasu into his eyes to attack obito if he revealed his face

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[Sasunarufan13]

Killing your best friend or a family member is a requirement to gain it. He refused to kill Naruto because he didn't want to gain power that way, but Itachi was his brother and he killed him, so he gained the Mangekyou Sharingan albeit with a bit of delay.

 

[AirWind]

Itachi "implanted" the amaterasu inside sasuke eyes, its not that sasuke had "awaken" it

 

[sulanis]

Itachi was an obsession to Sasuke which led to the closest person to sasuke and when Itachi died, he transferred power to Sasuke while sasuke released his own MS

 

[Narutohokage7]

Itachi tapped his head just before death, Sasuke was sad cause of that

 

[AirWind]

Itachi tapped his head just before death, Sasuke was sad cause of that

LOL u dramatically described it.

 

[Yoshino Shinohara]

Simply killing the person closest to you isn't enough. You also have to "feel" it to.

 

[Varrah]

Because Itachi gave him the powah, I think. :|

There were temporary given to Sasuke; the notion you have is based on a one-shot technique: Tensha Fūin: Amaterasu.

On topic, Sasuke awakened his Mangekyō Sharingan after learning the truth behind Itachi, which caused him emotional trauma—allowing him to awaken the Dōjutsu.​