Can you please write a short story about Batman and the Joker? It should be a darker tone. It does not need an ending.
Batman sat perched high upon Gotham's skyline. The bat signal shone brightly in the sky even still. He had talked to the police commissioner already but they kept the light on as a warning to criminals: Batman was here. But in reality, petty criminals had nothing to fear tonight; he was busy with a more important target. The Joker was holed up in an apartment building with a number of hostages. He had supposedly rigged the building with his signature laughing gas. They'd gotten as many civilians out as possible, but there were still far too many at risk.

Batman looked down at the building, planning his attack. The Joker would be on one of the top floors so that he could escape via the roof if needed. But Batman didn't plan to give him the chance. He pulled out his bat drone. "Scan the building, find the Joker," he said, releasing the drone into the air. It flew around the building, capturing infrared imaging of each floor. "There, the top floor. It has to be him." On the screen, Batman saw four bodies, three of which were sat on their knees as if they were bound with rope or wire. The fourth must be the Joker, the hostages providing him extra protection.

Batman crept toward the edge of the building and fired his zipline gun across. He grabbed the wire and lept, sliding across the zipline. About 15 yards from the building he let go and unfurled his cape, gliding across the rest of the gap. He aimed carefully, ducked his head to protect his eyes, and smashed through the window. He rolled to his feet and quickly fired a Batarang, pinning the Joker's shirt to the wall behind him.

"Well, it's about time, Bats. I was beginning to worry you wouldn't show," the Joker cackled.