Note: "Miraculous Cure" here that Chat Noir uses to deakumatize the butterfly alludes to the early concepts of Stones and Pearls (which were thought to be used for the Miraculous potions but were rejected by Astruc later on), specifically the "Pearl of the Heart".
RenaMouse/MariFoxMouse crouched down low, observing Chat Noir holding the akuma at bay until she executed her plan.
To be truthful, she had expected her kitty to tell her to distract the akuma while he pounced from behind (god she started to sound like Chat too). But the more she watched their battle the more she understood, her jumping rope couldn't do much to the akuma wielding a chello - another music themed akuma - and as far as Chat Noir knew, she was still a beginner who had gotten the Mouse Miraculous a few days before, of course he would be concerned with her facing an akuma alone head-on, not knowing she was actually Ladybug.
Still, she would need a plan before Chat Noir tired too quickly.
She missed having her Lucky Charm and handy Ladybug vision, it made things that much more difficult, but it also meant being more creative with the things she had at hand.
Mulmousse looked over the rooftop she was hiding on, toward a pile of trashcans. She could throw Chat Noir one of the lids and he could use it as a shield against the music waves from the chello, then she would try to trap the smaller woman within one of the empty trashcans. It was a gamble, a risky one, but it would be her plan A for now. Taking her jumping rope, Mulmousse smiled.
Chat Noir kept his eyes and ears open not only for the akuma he was battling against, but for his little mouse hiding somewhere and hatching a plan.
He was worried he had put too much of a task on her, being still a beginner hero, but this was Marinette, she was crafty, resourxeful, smart, she could figure something out.
He hoped at least, this akuma, despite looking thin and petite in build, was unecpectedly lithe and durable.
Making a high backflip into the air, Chat Noir grinned down at the akuma before he spotted Mulmousse on the rooftop, waving her hand towards him.
Then, she threw a strange, round object at him. With cat-like reflexes, Chat Noir caught it easily and the pungant smell of fish and other foul things hit his sensitive nose full force.
Was this the lid of a trashcan?
Landing back on his feet, Chat Noir reflexively brought the lid up to counter the sound waves coming from the akuma's chello, his arms straining against the force behind the attack but the lid remained intact.
He was amazed how durable a trashcan lid could really be.
His eyes flew open and he turned his head. Just where was Mulmousse?
"Kitty!" The familiar call of his nickname made him turn abruptly back to the akuma, just in time to see Mulmousse trying to imprison the akumatized woman in a-
Chat Noir tilted his head, "Uh, princess? A trashcan?!"
Mulmousse latched onto the trashcan that had the woman trapped within, who began to stumble backward in her frenzy to get out of Mulmousse's grip.
Mulmousse smiled, "Yes, just a bit more!" the woman's legs tripped over the hero's tightly drawn jumping rope, falling backward with a scream.
Mulmousse jumped off, watching as the akumatized musician fell into a net she had set up just shy of touching the fountain water underneath.
Chat Noir jogged up to her quickly snatching the akumatized object and breaking it in half, the dark butterfly flying out.
Chat Noir called upon Plagg's power, "Miraculous Cure!" Chat Noir's claw glowed bright green as opposed to the usual black when he channeled Cataclysm and when he touched the butterly, it's dark color vanished and changed to a bright white, flying away peacefully as soon as Chat released it, "Bye little guy."
Mulmousse smiled, secretely proud of her partner for handling everything on his own, proving just how capable he was without her too. She never doubted it in the first place.
They locked gazes and Chat smiled, "Phew, that situation sure had been high strung, huh?" he grinned cheekily and Mulmousse giggled.
"Squeak for yourself, I had it under control." she pretended to examine her nails, smiling softly soon after, "But honestly, I couldn't have done it without you chaton."
Without even realizing it, she had held out her fist for their signature fist bump.
"Oh no, you did an amazing job yourself princess, color me impurressed." Chat Noir's praise made her oddly happy and giddy, she didn't even know why.
She didn't even hear the confused questions coming from the previously akumatized woman when Chat Noir's fist effortlessly met her own and his eyes twinkled warmly down at her, "Pound it, purrincess!"