See, the whole issue with the fight so far was that it was fairly conservative. Samantha was many things - fairly lazy, for one. She preferred getting things done quickly if at all possible and go back to kind of dawdling about in a somewhat awkward fashion. So, in this case, a long and drawn out battle was beginning to work against her - she'd gotten in some pokes at the start, and now she was being weighed down quite literally by Camelia's semblance. So, she made a decision.
She had a fair amount of aura, and a helluva lot of built up charge. It would hurt like bugger, but...
Instead of making any major movement to get away or counter the attack, Samantha pulled herself forward towards her opponent with the chains, charging what she could into the sword to prepare for the next step. This lead to her hitting the floor in a fairly haphazard position as she placed her sword above her, Unity getting a fairly solid hit in on her as she let out a gasp from the hit to her side. Prismatic Performance blocked what Samantha could of the attack, but it was still a powerful gravity-enhanced blow. However, this also left the hilt of the weapon touching against her opponent directly. Focusing herself despite the pain at her side, she released the entirety of the built up sound into one singular point, creating a sudden loud booming noise and causing a powerful wave of force to blast outwards, aiming to send it directly into her opponent - she'd taken the hit to get into point-blank range for this, after all.
(Combined damage from Unity and fall: -25% aura (10% fall, 15% blocked hit), Semblance charge into Prismatic Performance: -9% stamina, Sound Cannon: -34% held charge, -40% aura, possible disorientation/damage on landing, large knockback)
[AURA: 52%]
[STAMINA: 33%]