They say eyes are the window to the soul 自分 takes such a phrase & turns it very literal, as 自分 can see 相手's entire essence within the flickers of their gaze, understanding every single cause & effect of 相手's totality, from the reason they chose to attack thos way & that way, all the way to why they will soon attack, allowing 自分 to preemptively counter 相手's moves before they even manifest.