Although Xiao Shi had already obtained the Yin flame, he had yet to transform the Yin flames into his second Intrinsic Martial Blood. Assassinating the Third-Blood Flame Bearers would still be relatively difficult for him.
However, Xiao Shi felt that he could still give it a try. Even if he could not kill all the Third Blood Flame Bearers, as long as he could successfully kill one, it would be worth it for him. Even if he failed and his whereabouts were exposed, he could still escape through the Divine Stone Rainbow. It was not a big problem.
So under his continuous assassinations, he first dealt with the first and second-blood Flame Bearers. Under normal circumstances, even these first and second-blood Flame Bearers would more or less sense danger. They wouldn't be killed without being able to sense anything.