User:SOTO/Forum Archive/The Panopticon/@comment-5940646-20151203081819/@comment-1789834-20151203090009

The Doctor simply works it out. He works out that this prison has ever only had him as a prisoner. The Veil is evidence of this because, if a prison had the capability to pluck things out of your nightmares, why would you use the Doctor's nightmares against other people rather than their own nightmares against themselves? Personally, I don't think it has anything to do with memory. The Doctor looks at the evidence around him and works out that he is one in a very long cycle of Doctors that have been running around that castle. By the time he faces the Azbantium wall, he's merely accepted what he has to do and gets on with it. In summary, I agree with you haha. The only way memory could play a part is if the Doctor had implanted it into his replacement's subconscious when he connected himself to the teleporter. As that is never mentioned within the episode, that remains just a fancy speculation. :P