This makes sense because fans know that Yuji first learned Divergent Fist, and then, after training with Todo, he managed to tap into the power of Black Flash. JJK's Culling Game arc was a major ...

At the beginning of JJK, all Yuji could do was utilize cursed energy at a basic level and use Divergent Fist to deliver physical blows with a lag to his enemies, making it a double whammy.

Yuji’s Divergent Fist takes full advantage of this as it’s a punch that essentially hits twice. When his fist hits the opponent, Yuji’s cursed energy then flows in to create a second impact.

This is why I love JJK fight scenes so much. ... The first is an extension of the tease Todo made last time that suggested that Yuji’s Divergent Fist could get much stronger.

JJK creator Gege Akutami reveals how he created Black Flash, ... So I think Divergent First and then Black Flash were born as moves that not many others can do,” Akutami said.