Board Thread:Theories and Speculation/@comment-36512555-20200101053037/@comment-32685487-20200103225534

Kakashi indeed did react to it, but he had the Sharingan, wasn't nearly blind and nearly dead, and was at full health. Itachi was on deaths door when he did this and as shwon from his perspective all he saw was a spec of a blur when he was looking at Sasuke up atop that stone structure. He could not see actually see Sasuke let alone Sasuke's arms, the only thing he could see was extreme blurs and the level of light change, combined with the fact that he's not deaf so he where Sasuke's voice was coming from. You all keep saying this "he choreographed it" bullshit, no all he said was that Itachi couldn't escape this one, and it was unblockable like Amaterasu then he says dissappear with the thunder. Itachi only saw the sky get brighter.