( He narrows his eyes, sharp. Of course Lan Wangji knows him well enough by now to know where his priorities lie. It isn't even the first time he's thought about it. If Zhou Zishu had been there when Wen Kexing found the hand, doubtless he'd have left it where it lay. But he hadn't. )

Would fire work?

( He had kept it because he thought he might need something to bargain. And now? Does he? Zhou Zishu is healing. There is little Wen Kexing needs beyond that. )

Or would it just release the thing from it's mortal prison. You're the ghost whisperer, tell me I'm not inviting myself to further trouble.