Plot hole: Just how does the Mad Hatter know where to send his brainwashed henchmen to invite Batman to his tea party? He comes up out of the sewer, and there they are standing there.
Answer:1. There could be any number of reasons but the most highly likely one is that he wants Batman to see the face of the man who would beat him. 2. The TN-1 drug is a more powerful version of the strength enhancing drug Venom. Since Batman has shown to be quite a capable fighter, Bane had it with him and used it during his fight with Batman as a last resort to kill him.
Answer: 1. There could be any number of reasons but the most highly likely one is that he wants Batman to see the face of the man who would beat him. 2. The TN-1 drug is a more powerful version of the strength enhancing drug Venom. Since Batman has shown to be quite a capable fighter, Bane had it with him and used it during his fight with Batman as a last resort to kill him.