[Without saying anything, he pulled a piece of blank paper over. He draws a different array, one that requires slow, careful and above all, precise lines. When it's done, he slides it over to Wei Wuxian.]

If it's drawn on most talismans, it will cause its function to become reversed. Though with anything drawn with blood it could become problematic.

[And if anything, using it on something meant to summon may very well just banish.

That being said...]

It is impressive but maybe you shouldn't have done it. Some things are lost or forbidden for a reason.

[Yes he is scolding you!]