If Castiel is laid low by Ishiah's words then he is positively hunched and pale by the time Robin is done speaking.

"You all have my apologies for the way that I approached this," he murmurs, torn between his duty and his devotion to staying alive and well for Dean. "I think there are alternatives is what I should have said. There is a spell to weaken my grace and talk of reapers who might offer a safe space. You are all my family. Please forgive my insolence. I only want a chance at my life with Dean."