Silently, he barely nods as she spoke. It was half truth, given he had gotten over the guilt of trapping Rose in another dimension and giving her a part of himself eased that pain greatly, but here he felt completely helpless and worthless.

"But you weren't there. You didn't see it..." The Doctor wasn't putting any blame on her, but realizes that he was probably coming off as condescending. "I was useless during my escape attempt just as I was useless with that bloody sea beast."