Re: "The Dark Knight Rises" Review and Discussion Thread (spoilers)
It could be for Blake.
What I want to know is, what is Gordon supposed to think when he discovers the signal? As part of an apparent triptych of scenes featuring discoveries on the part of Batman's confidants ( Fox: autopilot, Alfred: cafe, Gordon: batsignal ), is it intended to hint at Wayne's survival?
Just walk away, and there will be an end to the horror.