Godslayer

Despite the powerful ability at your disposal and the adrenaline rushing through your veins, you still had the presence of mind to recognize the challenge ahead of you. While your semblance was the key to winning the tournament you still needed to find the lock, a way to actually apply it to Caitlin. She had never been so much as touched by an opponent, making sure to always keep the exact distance she needed to control and demolish her opponents. It was surreal, no one was that good, not even her. There was more to it. It was a semblance, you knew that much, but that didn't help at all without an idea on how it worked. So you pulled up recordings of her previous fights on Infotracker.

After jumping through tens of videos you found one that was interesting. It was from two and a half years ago, a few months before her current win streak began. The battle was between her and a female teacher who bore quite the resemblance to her. Actually, wasn't one of the staff members related to her? You checked the school records and sure enough there she was. Morgan Danaan, 26 years old, graduate from Beacon Academy and therefore a certified Huntress. She is Caitlin's older sister and currently employed as a teacher for the advanced combat classes at this school, which explains why you've never studied under her. If you had more time you could have gone and pressed her for more information, but the recording of her match with Caitlin would have to suffice.

It started out surprisingly normal, Caitlin and Morgan kept some distance, both with relatively long weapons as Morgan wielded a Warstaff. They traded hits for a while and Caitlin seemed downright cautious about being too aggressive, it was a far cry from her current fights. A few minutes of slow paced sparring later Morgan upped the ante.
She seemed to concentrate and began to... vibrate? Her silhouette became foggy and hard to see but you could hardly believe your eyes when her form just split. Not into pieces, but three identical shadows of herself. You were unsure if they were even tangible until all three started attacking Caitlin at once. The strikes were coordinated, as if controlled by a single person.
The three copies must share a consciousness then, meaning part of her was likely present in all of them. That seemed like a double edged sword, it gave her precise control and an advantage in numbers but also meant damage to any of the three directly affected her aura. Caitlin seemed nervous, but not surprised, she was probably familiar with her sister's semblance already. Despite that, the fight was lopsided from then on, there were few huntsmen, let alone students, who could stand their ground against three trained fighters at once. She tried her best though and it was clear that even back then she was extremely skilled. She landed hits where she could and recognized the few openings in Morgans attacks, likely left there on purpose to test her younger sister. As the fight neared its end Morgan became more and more ruthless, she seemed to say something to Caitlin, but you could not make out what it was. She continued overwhelming Caitlin, even more aggressive and unforgiving in her **** than before. This was brutal for sparring, she wouldn't really be able to learn anything if all she did was take hits, right? No one would be able to concentrate under such stress and pain.
Wait, stress? Was this... more than just a normal training match? You remember that a local tournament was taking place around the same time, though it was really just for the upperclassmen. But Caitlin attended it, didn't she? She got all the way to the finals you remember, but lost to a student just about to graduate. How did she go from this fight to beating several far more experienced students in a row?

The answer came a few seconds of hard to watch combat later. Caitlin was kneeling on the hardwood floor of the gym, hands shielding her head when something changed in her attitude. One of Morgan's shadows was about to land another attack, aimed squarely at her back, but Caitlin rolled to the side just before the staff passed her previous position. She had been turned away, and you were doubtful about the possibility of her hearing the attack and its angle so clearly. No, this was her semblance, you were certain of it. Caitlin must have realized this too as she picked up her spear with trembling hands, but renewed confidence. Two of the phantoms now dashed towards her, one from the front, likely a distraction, and another from the side about to strike her ribcage. In response Caitlin jabbed her weapon forward, causing the first shadow to retreat. Caitlin capitalized on that and immediately swung her spear around her waist, slashing right through the second copy. It felt like you were watching an entirely different person. Caitlin still took hits but they seemed like calculated risks, rather than mistakes. Soon enough she was dodging all three Morgans at once and always found ways to retaliate against at least one of them every time. Her spear twirled and twisted through the air with her long ginger hair following suit. It was like the future bent to accommodate her actions... or the other way around. Maybe she had never read her opponents, but the future itself? It must be somewhat limited though, as she would otherwise have been able to prevent the few losses she did experience.
While the video ended soon after with Caitlin's victory, your thoughts were still racing. Predicting the future? Was that even possible? Did that mean your fate, and everyone else's were long set in stone?
Philosophical implications aside, you had to figure out the details. It seemed she only ever saw a few seconds into the future as that was usually when she initiated her counters. If that was true you had no way of ever beating her fairly, neither could you get close enough to use your pen. So you had to figure out how to use your ability to circumvent hers, which was much easier said than done.

You looked at Infotracker for inspirations and got irritated when you saw that you still had about six different programs open, you always forgot to close them when you were done. So you went through them one by one. Browser with the school homepage, closed. Online banking app, closed. Messenger app with a nude from Lila, clo- wait no, saved and then closed. You'd have time to enjoy it later, you promised yourself. After closing two other apps you came across the last. It was the tab with your signature that you used on Ripley's shirt.
That could work, actually. It wouldn't be permanent, but it didn't have to be. What you needed was for it to give you time to get close and mark her with your pen.
All you needed to do was raise Infotracker, project the hologram onto her, draw her attention to it and then approach her without having it leave her body.
Okay that was still a challenge, but at least you had a plan now.

You used the last few minutes before the final match to test and adjust Infotrackers projection to allow you to approach without distorting the image. You still weren't sure how you'd get her to look at it, but that would have to come naturally. You were aware that in theory you could use the projection to take control of the gym and perhaps the tournament itself, but you didn't want to draw too much attention to this ability just yet. Using it as a holographic projection on a single person could be played off as some sort of paralyzing projectile using lightning dust, but taking over an entire building? There were bound to be loose ends which you really couldn't afford. Shortly afterwards the bell rung, beckoning you to face fate herself.

Once in position you did some final adjustments to Infotracker and pulled up your sleeve to reveal your first and only line of defense. Guilt was eating away at you, but this was the only way to survive this, let alone achieve your goals. When the match started Caitlin was immediately rushing towards you. In response you only raised you forearm hoping she would see the writing on it before tip of her spear gutted you. Thankfully she did, but her reaction was not quite ordinary. "So it's your body, hm? Well no matter, I won't have to touch you if I can make you exhaust yourself and have you forfeit all on your own." Gods above, you thought her sister was the merciless one.
Just as she had threatened, she didn't give you any room to breathe. She always knew where and how you would move and would make sure to always hit just next to you, yet never so much as scratching you. You felt like you were running for your life, even though you knew she couldn't actually do you harm.
Focus. You needed to focus. You stopped dead in your tracks while sprinting and turned towards her. They say courage is doing the hard thing, facing danger and your fears when you don't have to. Well, you were about to be real fucking courageous right now, you thought mockingly as you lifted your arm and activated the projection.

The next few seconds where a blur. Just before the hologram appeared Caitlin looked confused, as if what she saw with her semblance was nonsensical or impossible. Her gaze lowered towards her chest on it's own before the hologram even appeared. Once it did her face went blank for a second and then returned to a more natural look. This was your cue to move. Your steps felt heavy with the weight of your future. Your hand was trembling when it searched your pocket for the pen. Caitlin must have known what you were doing, after what happened just now you were sure of it. Even now she was seeing everything you would do before it happened. She lifted one of her arms and removed the bracer covering it, sensing what you, currently her owner wanted to do. The sound of the pen softly moving over her soft skin filled your mind, but you were focused enough to not make a mistake.
You looked over what you wrote hoping dearly that it would work.
"Eugene Bluebeard's Ally"
Taking one last breath you deactivated the projection, yet Caitlin didn't immediately beat you to a pulp, that was a good sign. You knew it was a stupid idea, but this was different than with Lila. Caitlin hadn't done anything wrong, she wasn't abusive or cruel like Lila or Zane. She was an inspiration, a shining example of what huntsmen needed to be, more than you were at least.
You couldn't just take that from her.
What you could do was challenge her fairly.
"Caitlin, I want you to deactivate your semblance and fight me in a duel." you said, as you crossed out the protective writing on your arm. That seemed to have worked, as Caitlin didn't object the prospect of fighting you past a concerned glance. "Of course Eugene, I will show you what I can do, even without my semblance."
You took a few steps back and assumed your usual fighting stance your right hand hovering over the hilt of your blade. Caitlin did the same, cracking a reassuring smile at you "I won't hurt you more than necessary!"
The audience must have felt the anticipation as they were getting restless at this change in atmosphere. This was two students going all out, no tricks, no games, no cheating. The best of the best against the orphan left with nothing but a name too big for him. Well, you would show them. You would earn your way to Beacon. You would become someone that could make your parents proud, wherever they were.

You felt somber as you charged ahead, putting raw emotion into each strike and feeling trauma built up over a decade fly out of your body with each hit you endured. It was a back and forth, like a dance between old friends. A dance you didn't deserve, but one your conscience needed. Caitlin's style was fittingly elegant and effortless and even without her foresight she still knew most of what you were planning. Unpredictability, however, was something Jean had imprinted upon you in your two fights. And so you stopped you consciousness and let your instincts take over. Caitlin was caught off guard by this change in your attitude, almost everyone tried to focus compulsively when fighting her and those that didn't usually were worth worrying about.
She recognized now that you were an actual threat, but smiled as it assured her you could be as good of an ally as she had expected you to be. It had been such a long time since she last felt the thrill of battle.

Your blade sliced through the air, colliding with the metal of her spear. Sparks flew and beads of sweat were running down your faces, both of you were getting exhausted. While your aura was getting low, but somehow you had ensured she wasn't doing much better. It was time for the finale. A stab forward. Retreat. Sidestep. Vertical slash. Shit, her spear was a lot closer than you expected. You took the hit, even leaned into it. You grabbed your blade with both hands and lunged towards her chest. As you made contact you saw the fizzle of her aura, emerald green like her eyes. They looked at you filled with pride and content.

You checked, because you could not believe it. Somehow you had aura left. You must have taken just enough **** out of that last attack to... win. You really won. The crowd was getting loud, but they felt distant. Wait, why was everything going dark? Why were you falling?

That was your last thought before passing out.