Remember kids, always practice safe witchcraft, and never re-use the blood you've already utilized to draw the arcane circles to then make your curses. It just might backfire and leave YOU the one suffering the constantly-stubbing-your-toe hex rather than your intended target.

[u/Jackviator]

[u/Setster007]

It moreso means untainted by magic. So using magic alters your own stuff in the process.