Board Thread:Episode Discussions/@comment-1181222-20171025100708/@comment-734582-20171025212549

As far as i can tell, it was simply assumed to be a Kiba power. It's not a retcon if it was fanon all along.

Also, i'd forgotten how Raiga used it, since he constantly channels lightning from the sky. Makes sense that in this boruto episode, it's inner power since we don't see her charge the blades even once. Raiga did it basically every other jutsu.