They're under the map in order to most likely stop people targeting/seeing their names to report them. Had a bit of a shock in Central Thanalan when this happened last week. Fortunately due to the geography in certain areas their names were visible above ground and I was able to report them.

Though last night in the Shroud an archer was under the map and appeared to be running through attacking every low-level creature it passed. If it weren't for the densely packed squirrels trying to attack through the ground while spinning by at velocity like a critter tornado you wouldn't know what was going on.