Ignis hadn't noticed Regis or mostly Clarus using it, though it wouldn't shock him. During heated 'discussions', both were known to raise their voice and oddly enough, things seemed to clear up once it happened. Now he knew the how and why of it and it disturbed him. It disturbed him enough that he climbed to his feet and padded off into the tent, settling himself in the security of his nest without even realizing that he'd done it seeking comfort.