Panel 1: Batman stands at the gates of Arkham, futzing with the locks. Nightwing is with him, watching his back in case someone tries something.
Batman: I SWEAR, THE NEXT TIME SOME SHENANIGANS GO DOWN AT ARKHAM ON HALLOWEEN, I WON'T EVEN RESPOND. IF THESE IDIOTS CAN'T RECOGNIZE A SIMPLE PATTERN, THEY'RE THE ONES WHO SHOULD BE IN THE PADDED CELLS.
Nightwing: HELL, BRUCE, I DIDN'T KNOW TRICK OR TREATING WITH DAMIEN MEANT SO MUCH TO YOU. SUCH A DEVOTED FATHER.
Batman: DICK, YOU MAKE ONE MORE CRACK AND I-
Panel 2: POV from the door of Arkham. Batman and Nightwing are running through the path up to the main door of the gothic mansion-turned-asylum as turret robots in goofy halloween costumes rise up from the lawn.
Batman: HURRY, NIGHTWING, WE MAY GET INSIDE BEFORE THEY START FIRING!
Nightwing: ON IT, BATS!
Panel 3: POV from behind Nightwing and Batman as they enter the asylum, and see that it has been turned into a hall of mirrors.
PA: AH, BATMAN, GOOD TO SEE YOU BROUGHT SOME MORE GAME FOR THE HUNT!
Batman: YOU'RE NOT GETTING AWAY WITH THIS, JOKER!
Batman: UH... THE GUY. THE GUY WITH THE TRAPS AND THE... PURPLE?
PA: IT'S DEADSHOT! THE ONE WITH THE SCOPE EYE?
PA: ANYWAY, THE ONLY WAY YOU'LL BE ABLE T-
Batman: -TO RESCUE THE STAFF AND INMATES IS TO BEST THE MANY TWISTS AND TRICKS OF MY HAUNTED NOT-SO-FUN-HOUSE.
Panel 4: We see Batman solemnly standing by the doors where he was in panel 3 as Nightwing smirks at him.
Batman: YOU REALLY ARE THAT PREDICTABLE.
Nightwing: AND YOU'RE A BIG OL' HALLOWEEN HUMBUG.
Batman: SHUT UP.