"Not exactly," says Gideon, "but I know enough." Whatever revenant is attached to her blade is clearly a member of Blood of Eden. Presumably they'd been held in the prison on the Ninth, and died in captivity, and it had managed to hop off and hitch a ride with her when its skeleton had been taken for boiling and processing before being sent to work. "The only thing I don't get is why it thinks I killed it. I've never even been to the prison section of the Ninth."