Board Thread:Theories and Speculation/@comment-27916438-20170329044844/@comment-35622277-20170329055132

Ah, I see.

In theory he should be able to use it, considering EMS does not exert any strain on the user no matter what ocular ability is used. He probably mastered it, seeing as how when he battled the Five Kage he was aware of how to use it to it's fullest potential.