In my defense I have none

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The last thing Lena sees is a flash like dark shadow pass over Andrea's eyes, before a kryptonite dagger slides between her ribs.

The sound she emits is less of a scream and more of a surprised squeak as she sinks to the ground.

If you want to get to Supergirl, you're gonna have to go through me. 

It's not that she hadn't believed Andrea would do it. Lena was under no illusion of safety when she placed herself between Supergirl and the glowing green rock in Andrea's hand. She'd come to terms with the possibility of dying for Kara long ago.

What she hadn't been able to prepare for was the pain. The abstract of sacrifice was all well and good, but. Reality, this searing epicentre, a point of white hot agony turned molten, seeping through her body. No amount of her mother's decorum training had prepared her for this.

Something is filling her mouth, thick and dark and oozing. She can't scream. Kara sits, eyes silver, a world away. Kara. Lena has to move. She can't. Andrea steps over her, and is that the pounding of receding footsteps or the dogged beat of Lena's heart? Either way, it's slowing. Every inhale cracks her body down the centre, each exhale buries shards of glass inside the gaping wound. 

Her eyes are beginning to mist at the edges but she strains, listens. The sound that cuts through the haze is not the scream she dreads, Kara's agony as her veins sear emerald. It's not a scream, but a shout, and then a blur passes over her like light and shadow. 

Concrete cracks, or perhaps it's Lena's ribs. Sounds are muffled now, the world dulled down like the inside of a snow globe. Underwater, time passes sluggishly to where she lies, drifting, encased in glass. But someone is fighting the current, resisting the pull. Hands grasp her shoulders, burning where they touch. Through the rolling fog comes Kara's face, blurring out in red and blue and gold and sickly green. Lena wants to push her away, keep her separate from the venomous substance protruding from her chest, keep her untainted. But Kara's hands are dancing there-away along her cheeks, her jaw, Lena's own name sounding from her lips over and over, a siren song, calling her home. It's raining now, wet spots peppering her brow, or maybe the sun is crying.

"Lena, Lena," Kara is saying. It sounds like her heartbeat and she cannot bear for it to stop.

"Kara," she manages, a whisper, a prayer.

Her face flashes within Lena's line of sight for one perfect moment, and is she green-tinged or is it Lena's failing vision? A shiver passes through the air between them, I'm sorry fluttering like a bloodstained white flag but whether it falls from her own lips or another's, Lena cannot say. Then a sudden pressure at her ribs, a heavy push and release that feels like salvation and damnation all at once.

Lena hears a scream, two screams, billions. She is left gaping, open and exposed. Invaded by the air and exalted by the sticky-sweet blush of her own blood, her body purging itself. Through the slick of gathering crimson her head rolls to the side, darkness pressing in around her, eyes blazing with the final image of a limp hand on the ground beside her, veins shot through with glowing green.

For a long time, there is only darkness. The deepest blackness she has ever known, all-encompassing. Devouring light, thought, feeling. Lena floats, tethered to her own existence only by the pressing weight of the dark, closing in until the end of the world. 

Slowly, sensations begin to blur in and out. Cold, a deadening flow, hooking into her very marrow and stripping her from the inside out. She drifts, and then there's heat, scorching, radiating out from her ribs in scalding waves, and she wishes for numbness.

For a moment, Lena thinks she sees the star-burst of veins behind her eyelids, but then they are gone and all is black again. Sound fragments filter through her peripheral awareness. A great noise, banging and shouting and exploding. She slips back under.