Nightwing raced through the darkened alleyways, his heart pounding in his chest. He knew he was getting close. He had been tracking the movements of the villain who had taken control of Batman's mind, leading the Dark Knight on a rampage through the city. Now, he had finally caught up to them.

He emerged from the shadows, and his heart sank at the sight before him. Batman, his mentor and father figure, stood before him, his eyes glazed over and his movements robotic. He had been completely taken over.

As Nightwing stepped forward, he could see the determination in Batman's eyes. But there was something else there too, a coldness that made him shiver. This wasn't the Bruce Wayne he knew.

Nightwing knew he had to tread carefully. He couldn't let Batman hurt anyone else, but he also didn't want to hurt his mentor. "Bruce, it's me," Nightwing said softly. "Dick Grayson. You have to fight this."

Batman's response was a swift, brutal attack. Nightwing was thrown back against the wall, the breath knocked out of him. But he didn't give up. He had to try again. The two of them clashed in a flurry of fists and kicks, each trying to gain the upper hand. Nightwing was hesitant to fight back, knowing that every punch he landed was hurting the man who had raised him. But he had no choice. He had to stop the madness.

Batman was relentless, his movements precise and calculated. He knew every move Nightwing was going to make before he even made it. It was like fighting a machine.

But Nightwing refused to give up. He kept pushing forward, even as Batman's attacks grew more brutal. He could see the anger in Batman's eyes, the hatred that had taken hold. He knew it wasn't his mentor fighting him now, but something else entirely.

The fight raged on, until finally, Nightwing saw his chance. He launched a series of acrobatic maneuvers, dodging Batman's attacks and landing a powerful kick to the back of his head. Batman stumbled forward, and Nightwing tackled him to the ground.

For a moment, Nightwing was afraid he had hurt his mentor. But then he saw the confusion in Batman's eyes, the realization that something was wrong. "Bruce," Nightwing said softly, moving forward cautiously. "It's me. You have to fight this. You're stronger than this."

Batman shook his head, as if trying to clear his mind. "Nightwing?" he said, his voice sounding faint and distant. "What's happening?"

Nightwing breathed a sigh of relief. He moved forward, his hands raised in a gesture of peace. "It's okay," he said. "We're going to get you out of here."

And then, as if waking from a nightmare, Batman began to come back to himself. The coldness in his eyes faded, and he looked at Nightwing with a mixture of confusion and shame. "What have I done?" he said softly.

For a moment, the two of them lay there, panting and exhausted. Nightwing could see the confusion in Batman's eyes, as if he were struggling to regain control.

"Come on, Bruce," Nightwing said softly, using his mentor's real name. "You have to fight this. You're stronger than this."

Nightwing's heart sank as he heard the sound of approaching footsteps. He had almost broken Batman's conditioning, but it seemed the villain had other plans. He spun around to face the newcomer, his fists raised in a defensive stance.

It was the same man who had taken control of Batman's mind, a cruel and sadistic individual who seemed to take pleasure in the pain of others. "I see you've been busy, Nightwing," he sneered, his voice laced with malice.

Nightwing didn't respond, knowing that any words he said would be wasted on this monster. Instead, he focused on the task at hand. He had to get Batman out of there, no matter what.

But it was too late. Before he could even make a move, the villain had taken control of Batman once again. Nightwing watched in horror as his mentor's eyes went blank, the coldness returning to his gaze.

"No!" Nightwing shouted, launching himself at the villain with everything he had. But it was no use. The villain was too strong, too powerful. He knocked Nightwing back with a blast of energy, leaving him gasping for air.

And then, just like that, he was gone. Nightwing lay on the ground, his head spinning, as he watched the villain disappear into the shadows.

He knew he had failed. Batman was still under the villain's control, and there was nothing he could do about it. He wanted to scream, to lash out in anger and frustration, but all he could manage was a choked sob.

In that moment, Nightwing felt completely helpless. He had always thought of Batman as invincible, but now he knew the truth. Even the Dark Knight could be broken.

As he lay there in the rain-soaked alleyway, Nightwing realized that he had a new mission. He had to find a way to break the villain's control over Batman, no matter what it took. He couldn't let his mentor suffer like this any longer.