Moonbeam isn't stopping sneaking

The Feanwyyn Weald [Exits: north east south west] (Grey Aura) Mahendorin is here. An arial in a simple green tunic flits through the forest, scanning the trees for hiding lumberjacks. A wooden adder has arrived. A thin whisper spider has arrived. <696/713(97%hp) 770/1096(70%)m 98%mv 16500tnl> <46> You scan north. ***** Range 1 ***** A misshapen black warg stands unmoving among the trees, its feral yellow eyes glowing in the darkness. You scan south. ***** Range 2 ***** A beautiful bluebird dozes on a tree branch, keeping one beady eye open. ***** Range 4 ***** A lean, brown rabbit sleeps undisturbed in the underbrush. You scan east. You scan west. You scan up. You scan down. <696/713(97%hp) 770/1096(70%)m 98%mv 16500tnl> <46> co 'primordial vengeance' mah Mahendorin leaves. It also didn't stop a dark elf or a thief from sneaking just after this.