Board Thread:Theories and Speculation/@comment-36512555-20200202084241/@comment-32685487-20200213192802

It doesn't show you him stopping it on panel or on screen, it skips over it in the manga and anime but Zetsu comments that he did so in both iterations, for example the flames in the woods are still burning in both media, but the flames on Sasuke are not in both media.

https://automanga.com/uploads/manga/naruto/chapters/390/09.jpg

Shippuden 137 at 15:26

Itachi can extinguish the flames so according to your logic Itachi has Blaze Release.

Now on the other hand I just watched episode 143 which is when Sasuke first extinguishes Amaterasu, it took a lot out of him just to do that and his eyes were strained a lot. MAYBE Itachi can use Blaze Release but it strains him too much to do more than just extinguish the flames as he was also similarly strained after the Flames on Sasuke were gone.. and another thing.. if Itachi does have Blaze Release maybe he can shape the flames and used them to cut through the toads stomach too, after the flames were set upon the stomach.