"I... I don't know what you're talking about." Wang Xiang repeated his earlier words. This was a very common reaction for suspects under interrogation. Still in shock, he hadn't yet entered a state of rational thought where he could weigh pros and cons. But instinctively driven by fear and a desire to escape, he could only spout useless nonsense.
Liu Jinghui remained calm, crouched down, lifted Wang Xiang's chin, and spoke in an extremely slow tone, "You can't get away from this. Think about it—this is the crime scene, and you were hiding under the floor, in such a secluded sewer for several days. Can you explain that? If you can't, we have witness testimonies."
He was bluffing. If a professional or even a lawyer were present, they'd quickly brush this line of reasoning aside. But Wang Xiang didn't have that option now and wouldn't later either.