Heartbreaker attacked swiftly. Cat Noir split his baton, parrying every blow that came at him, but still he was driven back. He did his best to keep up with her, but somehow every time he blocked, the next attack was already there, exploiting whatever opening he had provided. He did his best to focus, to analyze her attack patterns, but the cacophony of wails from Heartbreaker's victims were filling his ears, amplified by his enhanced senses, and it was very distracting.

She's attacking so quickly! he thought. He was pushed to the limit just holding her back with no opportunity to retaliate. If not for his lightning fast, magically empowered reflexes, combined with his skill in dueling thanks to his fencing lessons, he would've been easily outclassed.

Hoping to change the pace of battle, he jumped back with a flip. As he landed, a dagger was already flying at him, mere inches from piercing his chest. He deflected it at the last second, but another one was already headed for him, and another. Soon he was running to get away, deflecting a barrage of daggers thrown at him. The way they were thrown was precise, each one exactly on target. It was as though she always knew exactly where he would be, no matter how he dodged or deflected.

Finally, Cat Noir ducked behind a car stopped on the road, the sound of the driver crying filling his ears, causing him to growl with frustration. How could he fight her when she was so fast? No, she's not that fast, he was starting to realize, it's like she knows my fighting style! She always knows what I'm going to do. Has Marinette watched me fight that often?

"Come on out and fight me, kitty!" Heartbreaker called out, "Or are you a scaredy-cat?"

He recombined his staff as he considered his next move. The pouch must be where the akuma is, he had to get to that. Despite the noise surrounding him, he was still able to make out the sound of her footsteps steadily approaching the car from the other side. He listened carefully as she came closer. He heard a heavy step… a jump! He looked up just in time to see her coming, but his hand was already at the ready. "Cataclysm!" he shouted, leaping into the air, his hand aiming for her pouch.

Cat Noir was precise with his attack, hand outstretched to grab the akumatized pouch and end this battle here and now. He saw Heartbreaker's eyes go wide as she realized what was about to happen. Her reflexes were too good, though, and she twisted out of the way just in time, his hand passing through empty air.

Cat Noir did a backflip and landed on the car behind him, holding his staff and power of destruction at the ready. His attack had missed, and that meant he had to hurry. It would only be a few minutes before he turned back, then the battle would be over for him.

Heartbreaker landed in a crouch, her back to him. She glanced over her shoulder, considering her options, but he couldn't give her the opportunity to plan. He needed to attack now and hope for an opening, and for his Lady to show up and help soon. Where are you, Ladybug?

He leapt forward, pressing the attack before Heartbreaker could fully recover. She pulled her daggers again, countering his initial strike, but he kept at her, this time keeping her on the defensive. His cataclysm was tricky to use right here. He needed to make sure he didn't waste it on one of her daggers by accident, but he also had to keep it threatening her.

Once again, Heartbreaker seemed too fast for him to land any hits, but as he watched her, he realized that she was predicting his attacks. How does Marinette know my style so well? he wondered. He rarely ever saw her during his fights, now that he thought about it. Just at that moment, he heard the sharp beep beep of his ring. He needed to hurry.

"Looks like you're nothing without your Bugaboo, huh kitty?" Heartbreaker's choked voice taunted him.

"I can beat you on my own," he growled, not letting her distract him. Where was she, though?

"You better, it looks like she's not showing up," she went on, eyeing him darkly, "I'm sure she's watching right now, waiting for you to lose. She's always wanted to get rid of you anyway!"

"Shut up!" he shouted, feeling his anger rising. Those words cut deep. They were words he always feared hearing Ladybug say to him, words he had only heard spoken aloud from the Nightmare Ladybug he faced with Sandboy. Did Marinette know about that? She seemed to understand him as well as he understood himself.

"She never loved you!" Heartbreaker shouted, echoing Nightmare Ladybug again, "She never will love you! She hates you!"

"SHUT UP!" he shouted again. It's not true, he told himself, losing his focus on the battle, It's not true!

Throwing caution to the wind, Cat Noir started swinging his cataclysm hand more wildly, trying to throw Heartbreaker off her rhythm. He needed to finish this battle now. His emotional state made rational thought difficult at that moment. Between the taunts, the constant wailing still pervading the street around him, and the ever-present guilt for his treatment of Marinette that caused this mess, the one thing he could not do was think clearly.

He was caught completely off-guard, then, when Heartbreaker suddenly dropped a dagger and grabbed his baton. Before he realized what she was doing, she twisted it toward his other hand, slamming it straight into his palm. The cataclysm took effect immediately as rust spread across the surface of the otherwise indestructible weapon. No! he chided himself internally, looking on helplessly, how could I be so reckless! Soon the dust of his weapon's remnants was scattering in the wind.

Note: Someone posted an anonymous comment, so I can't reply to it, but I wanted to provide an answer. In Mayura, we see Cat Noir using his baton in his cataclysm hand, implying that even cataclysm can't destroy it. However, Thomas Astruc stated that this was an animation error. Source: /Thomas_Astruc/status/1060579368475467777