Board Thread:Versus Debates/@comment-27418151-20160108230836/@comment-26636534-20160111145814

@Ravenlot 27

The fire seal has not been used in an actual fight, so we cannot say how practical it is, if Jiraiya was able to design a specific seal to suppress Kurama's chakra then it stands to reason he can design a seal to deal with Amaterasu. Amaterasu has been shown to be non-instantaneous and therefore avoidable or blockable, Sasuke himself has a particular(non-instantaneous) way of using Amaterasu in the form of blaze release utilized by his Susanoo.

Amaterasu was canceled out, it consumed the flames itself and went out. So a jutsu cast in the path of Amaterasu will be consumed instead of something else like Madara's chakra rod. Itachi was suffering from strain in his eyes and needed to put out the flame.