No signs of undeath whatsoever. 

"What the fuck? No?"

"Have you found Wei Wuxian yet?"

"Why do you ask?"

"Because I ran into Zewu-jun in Cloud Recesses, and according to him I left to go find him."

"I did do that. And I did find him." 

"And Lan Wangji?  Are they both still alive?"

"Obnoxiously so. Seriously, what's your deal?"

It's only fair, since that Jiang Cheng answered his questions.  

"I'm from the future."  He pauses, trying to figure out how to describe going back in time, then going forward in time to another point in the original timeline, except apparently altered by other time travelers, maybe?  

Or he can figure out how to deal with having his other self's sword pointed at him. 

"Which future. What did you do to Wei Wuxian?"

"What do you mean 'which future'?"

"I mean are you from the one where he lives or the one where he dies or some third one entirely. I mean did you hurt him, did you kill him. I mean are you the reason Lan Wangji doesn't trust me around my own brother." 

"After he attacked me.  After he killed our sister."

"Bullshit," he snarls, lunging forward, slashing. 

He pulls up his own version of Sandu, guarding, knocking away the attack.

"I didn't do anything you wouldn't have, obviously."

"But you claim Wei Wuxian did." Strike. 

Jiang Cheng blocks again.  He's had about 8 more years of practice.  He can keep blocking and dodging.

"Demonic Cultivation corrupts people.  It wasn't him by the end, any more than if he'd been a fierce corpse."

That sure isn't going to stop his younger version from trying!

"Try that on someone who hasn't been traveling with him for days. I'd love to blame being stupid enough to have sex in a burning building on some kind of mind-warping effect, but I think we both know better than that." 

"He what?  What the fuck?  With who?"

Maybe he can use the distraction to land a hit! He will sure try. 

"Lan Wangji." 

"Lan Wangji?"

Jiang Cheng doesn't have a very high opinion on Hanguang-jun's intelligence, but why was he having sex in a burning building.  

He very much does not want to think about him having it anywhere, and especially not with the Yiling Patriarch.  

"I mean, I wasn't happy about it either, but as far as things that happen in the future go, Lan Wangji descending to my brother's level of shamelessness and dumbassery is somewhat less horrible than me turning into a fratricidal maniac, so, you know." 

"Doesn't it bother you at all that you have all of your information from the future told to you by two people stupid enough to fuck in a burning building?"

Future Jiang Cheng has been defending for a while.  He will add in a few offensive swings and try to disarm his past self.  

"That would be a whole lot more compelling if you had said anything that didn't corroborate them!" 

Past Jiang Cheng has eight years less experience but fortunately at the moment exactly the same muscle memory, he can avoid being disarmed. 

"Did they bother telling you about how he also murdered A-jie's husband, and his entire retinue?  

"How many thousands of other people was I supposed to allow to die?  You think he was going to stop at killing his sister?"

"What I was told was that A-Jie died stepping between him and someone who was trying to kill him, which sounds a lot more plausible than that he'd willingly let her die. I don't know what happened with the peacock, but seriously, it's the peacock."