Does Cephiro fall under that oath now that Corwin is the Pillar?
Because if not, Balder would be surrounded by people and things that _could_ hurt him if Freyja used them as weapons.
(On the other hand he's still a Norse God. Killing those doesn't happen easily).
It'd be... darkly amusing to see reactions if he'd wound up with a black eye as a result of Freyja throwing a blunt object at him.