The Blood River Divine Sword could not be used consecutively; thirty-six Fallen Imperial Magnetic Beads were also destroyed in the void. He was clearly able to kill his opponent in just over ten rounds of direct confrontation, yet he ended up on the run with Tang Luo for a long time.
If he weren't afraid of exposing his identity, he really wanted to summon the Xuanwu Faziang to block in front, thinking just a little obstruction would be enough to smash the opponent's head.
But considering the higher-level implications, he could only reluctantly give up and watched as the elusive Martial Ancestor escaped.
Returning to Du Sha's side, he found that his situation wasn't much different. Facing a Martial Ancestor determined to flee, without some strong restrictive measures, it was probably very difficult to capture anyone.