[quote=@Vocab]
[@DarkwolfX37] everything about that would probably work, save the last.

It works the exact same as a Witches kiss, and therefore has only two methods of removal.

Have a Magical Girl remove it because magic.

Or kill the one who cast it.

I'd like to see you try number 2 >:D
[/quote]

The reason the last one would work is because the magic is centralized. If there's a mark, then it's because the magic is focused there. So it really just depends on the depth, and seeing as magical girls can survive a shot to the brain, (see Homura) any depth is removable. You'd have to force her not to in order to keep her enthralled.