Nothing, and Spirit never die.

There are those here who doesn't even have a soul.

It quite easy to figure it out for those with senseless souls, there is no common sense in them and they cannot comprehend anything holy.

And there are those with up to seven unclean spirits dwell within them are a little smarter but still detectable by those HEB souls.

As for free will.. there is no free will for the Spirit to enter any soulless beasts of the Earth but unclean spirits, who are in need of cleansing from the Earth.