Continuity mistake: When going to the Gotham City Bank, the clock tower bell will begin to ring. Alfred then contacts Batman and says that it's now 12:00 AM and wishes him a merry Christmas. If you look at the clock tower, however, the clock says that it's only 9 o'clock.
Alfred: Do try to be careful out there sir.
Batman: Don't worry. I'll take out those assassins before they know I'm there.
Alfred: It's not just that sir. If a curious child wakes up to see who's pattering across their rooftop, they'll expect Santa Claus. Not a black-clad bat creature.
Batman: I don't patter.
Alfred: *Sigh*.
More questions & answers from Batman: Arkham Origins
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.