There's something incredibly wrong here. Not knowing about the discharge? Understandable. The seizures? Even moreso. But to not know that Miles had been dead, when all of ImpSec had been desperately tracking down his body? No. Something is wrong.

"I died, Captain," he says simply. "You knew that. Or you damn well should have." Which is not a statement of ego, really. What the hell is going on here?