As far as he could remember, the Black Flash occurred when a distortion of space occurred due to cursed energy being applied within a few milliseconds, or even less. This greatly increased the power of the attack, but it depended mainly on luck, since no sorcerer was able to use the technique at will.
Jujutsu Kaisen: Becoming the strongest as Yuji Itadori
Anime & Comics · TheJiujitsuGuy
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