As dual natured beings in dracoform, characters can use their
Physical attributes and Unarmed Combat skills in conjunction with
their Natural Weapon attacks on both the astral and physical planes.
This might mean that they can use unarmed combat against astral targets while in their body, but the wording seems to be that dual natured beings can use unarmed combat at anytime to attack astral.
It is a big savings on skills for naturally dual natured beings. But I think it does have the downside of not being applicable to foci, except maybe the strength part.
Just pointing out a few lines of text I had not looked at before. It would help out a few character builds that would have high astral and unarmed combat.