tim drake’s snapchat is 90% him making bruce wayne do normal middle-class american things and filming the results.

The fact that Wei WuXian is still empathizing with Nie MingJue during this scene leads me to believe that Nie MingJue was, perhaps, not a fierce corpse. He was still very much alive even if it was a strange half-life. Jin GuangYao also orders Xue Yang to kill him (They use Baxia! How evil can you get!?) and you can’t kill someone that isn’t alive/is already dead. So CQL Nie MingJue did not die by qi deviation. He died by decapitation.