Why does Rin in blue exorcist have an eye bigger than the other when uncontrollable?


Why does Rin in blue exorcist have an eye bigger than the other when
uncontrollable?

It also happens in Naruto, when he doesn't want to use his powers to fight
Amaru when Amaru is possessed for example.




because his evil side is taking over and besides in every anime when their mad
one of their eyes get smaller than the other ![Image result for natsu getting
mad](https://media2.giphy.com/media/o7C2BKtp6gSd2/giphy.gif)

