[ ... Sigh. In for a penny, in for a pound. Or something like that. Wei Wuxian rubs tiredly at his forehead before pulling up the sleeve on his arm. The wounds are healed but there's a bit of scarring as he shows it to Xue Yang. ]

There were four slash marks on my arm that wouldn't heal until I took care of the people he had grievances towards. Once they died, the wounds healed.

There's a chance, in another ritual, that the person making the sacrifice doesn't want death out of their deal. That wounds like this heal a different way. It's just that in this specific case, the guy who wanted me to do revenge for him, wanted the people revenged upon dead.