Board Thread:Versus Debates/@comment-33308438-20180614101055/@comment-9782468-20180703131654

CombatIQmatters wrote: Itachi did react to the lightning though, which Princeharris corrected me to be 220,000,000 miles per hour (I erroneously was thinking of the speed of the sound of thunder before). Even if he saw sasuke waving his hand down his susanoo still needed to be activated quickly enough to avoid getting fatally hit. Its not like lightning is a slow attack. Itachi literally had probably less than milliseconds to form that defense. All sasuke's hand did was allow itachi to at least be mentally prepared for the incoming attack, but from what I can tell he didn't use susanoo until the instant the lightning came down. Everyone else addressed the other parts of your argument, so I'll address this one.

If I see someone aim their gun at me, and I dive behind cover before a bullet hits me, am I faster than the bullet? Or just faster than the aiming and pulling of the trigger?

Itachi didn't react to the Lightning. He had his Sharingan active, saw Sasuke's hand move down, and reacted that way.