Weak Heart
He stares through the glass at her perfect form hanging limp in her restraints, her optics offlined forever.
He can hear Rhinox behind him moving about but it's distant; his entire focus is her. There is something deeply wrong about her so silent without a trace of her smirk lingering on her lips. She was always so full of life; this unreasonable stillness is offensive to all she has stood for.
He feels something within him break. He never realized his Spark was so fragile, and yet he knows that its light is guttering even as hers did moments before.
A/N: 100 words; written for the prompt 'Weak heart'. Because apparently we need more angst in a drabble set about smiles. From the episode 'Crossing the Rubicon'.