Nothing could protect Khan from the quasar's energy. Nothing could even hope to block those particles accelerated beyond any reasonable or unreasonable level.
The crackling snake, with all its massive size, was less than air before that scorching power. The humming slashes couldn't even find anything to cut since each attack went beyond the concept of instantaneous.
The layer of clouds and all its thundering might were powerless, too, and the same went for the [Blood Shield]. Getting cut was unavoidable, and sudden death became a possibility.
A single cauterized wound in the right place could kill Khan on the spot, so he dropped any attempt at defense. He only left the [Blood Shield] in place while focusing his entire attention on attacking.
Because, even before that unthinkable spell, Khan had a plan that didn't involve simply waiting for the miniature black hole to become too big to control. Actually, that was another death sentence he had to prevent at all costs.
