Because I want some of that. Be nt even remotely near a keep and a mage suddenly snipes me and wont let me go back into sneak mode. Totally not annoying.
It's in the mage keep guard manual. Chapter 3: Spells for Spotting Sneaky Types.
"He who fights with monsters should look to it that he himself does not become a monster...when you gaze long into the abyss the abyss also gazes into you..."