With a dreamlike sense of lost control, I followed and leaned my own head against the surface of the door. The soundproofing was good, but no match for the Khumalo neurachem at full stretch. Somewhere down near the limits of hearing, noises trickled into my ear like stinging insects. A dull, rhythmic thudding sound and something else that might have been the pleading screams of someone whose strength was almost gone. It stopped almost as soon as I had tuned it in.