In the movie The Dark Knight Rises, Bane robs the Gotham City Stock Exchange, more specifically with the purpose of bankrupting Bruce Wayne.
What I don't understand and feels like a plot hole to me: Why does this transaction actually go through? Not only are there tons of witnesses that can attest that this transaction was essentially done fraudulently, one would expect that such a major stock exchange would just be emergency hard shutdown within seconds if a robbery attempt were to take place, just blocking all transactions until the danger has passed. The transaction done in the robbery to me just feels like in the real world, it would never have succeeded.
Why does this robbery manage to bankrupt Bruce Wayne like this?