Even more themes and layers getting discovered with repeat viewings
: Theatricality and deception are powerful agents.
: You're not Ra's al Ghul. I watched him die.
: [from behind Bruce Wayne] But is Ra's al Ghul immortal?
[Bruce turns around to face Ducard]
: Are his methods supernatural?
: [to Ducard] Or cheap parlor tricks to conceal your true identity, "Ra's"?
: Surely, a man who spends his nights scrambling over the rooftops of Gotham wouldn't begrudge me dual identities?
It's so awesome the way they tightly wove a theme together like this. Ghul teaches Bruce all about deception and theatrics while pulling a huge one himself, and it's only due to Bruce's time with Ghul and understanding him on some visceral level that he was able to put two and two together.