The ordinary-chakra version of [Flame Explosion Technique] wouldn't disappear after exploding in four dimensions; the chakra would merely lose some of its power and scatter.
This wouldn't diminish Otsutsuki Shibai's ability to sense his surroundings.
It might have seemed as though everything he'd done to flee just now was foolish, but that wasn't the case.
First, in Boundless Deep Space, Otsutsuki Shibai had no idea where Hui and Chuanhe actually were. No matter how fast he could teleport, it still took time, and their series of clashes had already proven that Chuanhe could attack him in that brief interval.
And after shifting down from "above" the Main Three-Dimensional World, he'd discovered at the last moment that Chuanhe could also use [...]