He feels as though the bottom of his suddenly-perfect world has dropped out from under him; the demons of his own imperfect past moving in at the scent of ruin.
He can feel the rush of blood in his ears. See the strobing of hospital lighting above him. Remember the despair she brought to his life, and to his best friend ...
"How much ... " he starts, his gaze fixed at some distant point beyond her chin and his voice suddenly hoarse. "How much did you see."