Forgotten vows

The moon cast an eerie glow in the damp, dark, forbidding alley. The
heavy, quick thump of her heart echoed through her head but she could
still hear him. She heard his frosty breath, his slow, deliberate
footsteps. He was nearer now, or so it seemed. But the alley stretched
on. Was it always so long?
Her footsteps quickened, his remained steady, but still he came ever
closer. She could almost feel his breath, freezing the hairs on the
back of her neck. She could still make it couldn't she?

No, it happened so slowly. She felt his hand grab her shoulder. He
pulled her round to face him. His face had no expression.
And then he slashed her. And he slashed her. She had to die. She
deserved to die.

And yet, it wasn't her. She just looked like her. And then he realised
it was too late and he knew that he, too, had to die. But he had died
long ago.