After finishing every one of them, he looked towards the cave. The sensation that something was looking at him was felt by him when he had finished the last person.
The spirit beast inside had come out of the cave as it had smelled blood.
He could have used a nihility sphere to kill every one of them, but he wanted to test Primal Essence on humans too, not to mention continuously using a nihility sphere would drain a lot of his spirit qi. Unless necessary, he liked preserving his spiritual qi.
In necessary moments, even a 1-second delay in recovery could create a dangerous situation for anyone.
Also, he wasn't going to hide from this beast anyway. He wanted to kill it to obtain its core; he wanted to see if there were any differences in getting laws from spirit herbs and blood cores of spirit beasts or not.
He was about to go inside the cave, but since it had come out itself, it didn't matter now.
