The Overseer accompanies Cho to the Sprawl and has the interrogator and his assistant killed .
Cho surmises that her superiors are aware of the effects of the Marker and are using those exposed as human guinea pigs .
The Overseer accompanies Cho to the Sprawl and has the interrogator and Cho 's assistant killed .
Cho surmises that her superiors are aware of the effects of the Marker and are using those exposed as human guinea pigs .