It's true! He wants to sympathize with them, because they're entities that no one is willing to sympathize and understand. Their existence is so lonely and unfortunate to him that he can't help but want to do everything that he can for them. ;A;

Hm!! He can just tell that something isn't human and see through the glamour that non-human entities put up to hide the fact they aren't. Encountering something that is non-human in general, he might recognize that she isn't human but also isn't supernatural either and be like dog hearing strange sound ... not sure what to do...