Ye Xiao and the Transparent Woman talked for a while. Ye Xiao also got to know many other things from her. He also left all other Demon Spirits he had caught. it is because after losing their demonic nature and becoming docile, they have already turned into Holy Spirits from Demon Spirits.
And since they are the people of a race called Holy Spirits Race, there is no need for Ye Xiao to catch them and keep them on the Second Floor of the Nine Story Pagoda. Anyway, he had kept them there only because he didn't know what kind of creatures they were at that time. Moreover, they were simply too strange, like a ball of water. This caught his attention.
Now that he knows everything and doesn't need these Holy Spirits, he let them go.
Moreover, he also made a plan with the Transparent Woman to transform all the Demon Spirits back into Holy Spirits.
.....
Three days later, deep in the dark world...
