The thought of killing a Saint-level figure without entangling karma was itself a mad idea.
Since the great prosperity of the Human Race, there had never been a precedent of a Saint-level figure falling to an ambush.
One reason was that the cultivation of those at the Saint-level was exceedingly high, and another was that they were often bestowed with numerous life-saving sacred artifacts.
Take Elder Xu as an example, with the Xuangjin Dragon Soul Armor and the Emperor's Void Phoenix Sword in his possession, unless a Saint King-level being intervened, instant killing him was extremely difficult.