Turn Back Time (Potterlock)

Save me if I become my worst enemy

As if in a dream, I fumbled with my timeturner. Two hours. That should be enough.

I stood in the entrance hall two hours earlier. I wandered through the corridors, numb with shock.
I had promised to save him. I had promised.
And here I was, once again running, trying to undo my mistakes.
I had promised.
And I would do everything within my powers to keep that promise.
I could not let him die. I could not do that to his parents. To John. To Mycroft. Mycroft who would never know that a Death Eater had killed both of his brothers. The same Death Eater who shared his last name, came from the same blood line.
Sherlock isn't dead yet.
Yet.
You can still save him.
I had just over an hour and a half to carry out the plan forming in my mind.
It had to work.
I walked up to the base of the tower, trying to stay out of the main corridors. At one point I heard footsteps, so I looked carefully around a corner. There was a girl walking towards me, looking surprisingly like Alabaster. She was carrying a sword similar to mine. I ducked back, and lent against the wall as I realised that she was me. And the sword was my sword.
But I was holding my sword.
This is weird.
But it was my only option to save Sherlock.
After the other me had walked up the tower stairs, I relaxed. She hadn't seen me. I had to wait until the very second before Sherlock was killed, because if I showed myself before then I could be in serious danger. I'd be disrupting the space/time continuum, or something like that. I had been told the dangers and rules about owning a timeturner, but now was not the time to delve into my mind palace to find them.
Now was the time to save someone.

A little later on, I heard voices. Sherlock and John walked past my hiding place.
The sight of Sherlock kicked me back into reality.
I quietly followed them up the stairs.
Then, to my horror, Sherlock stopped.
"John, can you hear someone?" Sherlock asked.

"No." John replied.

"Oh." Sherlock said, turning his head.
For a moment his blind eyes fell on me, and I had to remind myself that he couldn't see. I still sank back into the shadows despite that fact.

"Come on." John tugged Sherlock's hand.

"Ok." Sherlock said, following him.
I silently walked behind them, stopping just before the top of the steps. I slipped my shoes off, so I wouldn't alert the others of my presence until the very moment when I would appear. I heard my voice, talking quietly to John and Sherlock. Then silence, and then the other me spoke again, only to be answered by the voice of my father.

When he asked "Any other stupid questions?" I was up again, my feet pounding silently against the stone floor.

I stood in the shadows behind Sherlock and John, listening to the other me try and fail to still stall for time.

When the moment came, I acted without thinking. I had decided long ago that I would happily give my life for Alabaster or Sherlock, and, in that moment, I proved that I still stuck fast to my promise to keep Sherlock safe.

"Avada kadavra!" my father shouted, pointing his wand at Sherlock.
I jumped in front of my cousin, intercepting the flash of green light.