Han Sen wanted to explore the lake, but the sacred-blood creature would not leave the area, giving Han Sen no chance.
In addition, Han Sen did not want to take the risk in case there were anything dangerous in the lake.
"I should finish off the sacred-blood creatures first before exploring the lake." Han Sen had made up his mind to kill the sacred-blood creatures.
Now he had a better command of Yin Yang Blast. As long as he practiced it more, it would be easy for him to kill the creatures.
Very soon, Han Sen came to realize that it was not easy to kill the creatures. Although in repeated fights with it, Han Sen could cause damages to the creatures with different uses of the force, the creatures could always recover after soaking in the lake no matter how badly injured they were. Unless Han Sen could kill them directly, he hardly stood a chance.