Maybe they don't consider Corsanctum a threat? For that matter, did anyone declare war on Entai?
I believe Caerwyn sees Entai as an unwilling ally, and Entai probably feels the same. It could essentially go two and both are good for Entai. First, they could get support from Madina and Caerwyn, not directly but by means of keeping Corsanctum and Astrum busy. Or they could try and use this war to cause SA to join together, ignore their differences to deal with the external threat. ether way, their little rebellion might just stand given this new war.
