Lin Zhen's Black Hole Devouring technique remained an extremely powerful, almost invincible final move; if the divine power of the opponent wasn't at least double his, it was impossible to resist.
However, invoking the Black Hole Devour requires transformation into the Black Hole Beast, and there isn't much time for such a transformation in the midst of a master-level battle.
Earlier, Hei Huo's flames obscured his own vision, thus affording Lin Zhen with a rare opportunity of a calm attack. By the time Hei Huo realized what was happening, the Black Hole had appeared and it was too late.
With a terrible scream, Hei Huo spun and fell into the Black Hole.
The Death Ripples pulled him into the bottomless abyss of the Black Hole. An irresistible force began to compress rapidly, transforming his body into dust in a matter of moments, turning into the most basic element of the Black Hole, neutrons.