In a safe location, once Oliver was secured, Qi Suian didn't immediately start questioning him.
Interrogation involved torture and questioning, which meant one had to torture first and then ask questions.
He took out a series of torture instruments designed specifically for the Blood Race. After putting Oliver through a full session, he slowly asked, "Are you going to talk or not?"
At this point, Oliver barely maintained a human form, but he wasn't dead.
It was just that his powerful regenerative abilities were suppressed by silver, Holy Water, and other things, which was why he looked so miserable.
"You... You could have at least asked me first!" Oliver roared weakly.
He knew what interrogation was; it wasn't like he'd never done it to people before. But the normal procedure was to ask first. You only started torturing if the other party refused to talk.
