Board Thread:Versus Debates/@comment-5936871-20160126112547/@comment-9782468-20160208064810

I say again, Nagato is a master sensor. Idk what to tell you if you don't believe me.

We also know Obito sense Sasuke's Amaterasu by chakra building up in his eye because Obito literally said he could sense Sasuke building chakra up in his eye.