The latter two questions had been answered by an autopsy report and confirmed by the eastern octopuses: the sprinklers were not turned on from the control room, meaning it could’ve only been switched on by an external source. They traced it to an unauthorized wireless device, suspecting that the intruder had a remote in his trousers pocket that managed the feat.

As for the screaming, the sprinklers sprayed - not water - but zahar: an air-borne substance that tampers with its victim’s neurons. They’d feel as if a million needles were being pierced through their skin, causing momentary paralysis while their assailant struck. Zahar wasn’t lethal in open spaces, but...