Back when Rex saved the nobles, he knew the implications of his decision to transform.
Spirits in general don't have two forms, and those who have don't fully change races like he did.
Upon transforming, he knew that it would be the same as exposing his identity to someone who does not originate from this realm. Some of the less educated people might not know that such a transformation meant he came from the Mortal Realm, but all knew he wasn't from this realm.
Even with his exploits, the general view would not be favorable for him.
It didn't push people to outright view him as an enemy, but a lot of forces are keeping tabs on him.
Had it not been for Princess Davina's aid, he would probably be monitored all the time.
Rex knew all of this even before he decided to transform.
So naturally, the moment he exposed himself was the moment he accepted the risk it would bring.
All of this stemmed from a figure called Cardoc Mirza.
