He can't see. He might not be able to read again, and he won't be able to restore a book anymore. He certainly won't be able to fly when his wings grow back.

"Yes, sorry," he says again, trying to calm himself down. He's being silly. They've made it through so much more -- they've made it through Armageddon! Here he is, crying over a bit of blindness.

He shakes his head and clears his throat. Taking Crowley's hand, he traces the word, 'fix' again, this time without a question mark.