I needed to stone hiding onto her.
If you look back through my post history, you'll find a very similar story...
Some of the time, I use a rather sloppy mental shorthand. Several, equally sloppy variations, actually.
Simply, Magery and Meditation start with the same letter.
Of course, the process was not without some verification. However, they were both >GM.
I got them mixed up, and took 100 points of hiding out of my 108.5 magery.