[he hasn't slept since the night
Riku got him to, and that stress---coupled with the voice's constant, painful jabs, has taken their toll. Stripped down, his nerves and worries close to the surface of his skin, Sora is a timebomb visibly on the edge of exploding or burning out.
He sits in the cell, shoulders hunched underneath the blanket Rangiku had brought him, and glares fiercely at a corner of his cage---where the shadows are uneven, rippling]
Doesn't matter what you say. I know the truth.
[the shadows undulate with laughter only he hears. Sora's keyblades appear in dizzingly bright flashes, and he surges forward, slamming ineffectually at the bars]
LET ME GO!