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*.
Question: How does Copperhead know Joker took over Black Mask's mob?