Shen Qingqiu could explain that Binghe doesn't need to rule the Mansion because the Mansion needs it, he needs to rule it because Binghe needs it, but he gets distracted by the last point.

He'd already touched Enjolras before, he was pretty sure, but he does it again just to be sure—places a hand on his arm and pushes, gently, in case his hand passes through. Nope—solid.

"You still have a body," he says. "If you still have a body, you can definitely die again. I've died, too, and then after I died I got poisoned, and eventually the poison will probably kill me again." He says all of this with a kind of thoughtful detachment.