Aziraphale looks at him. Didn't-- didn't the other him or Lan Wangji explain about the whole beheading business?? There was definitely beheading business. His Chinese isn't too good but he's pretty sure that the word for head and the word for cut off haven't changed in a few thousand years.

He holds up his hand so that only Wei Wuxian can see, and writes it out on his palm, so he doesn't have to say it aloud in case anyone is listening in.

They'd definitely have to be at a very particular angle to see this.