When you fall off the edges of the Bloodfalls map in the south, you normally fall a little ways and are then ported to the NE section of the zone. However, if a leap ability takes you over the edge, you go through the porting point without being ported. You are then stuck below the zone geometry. You can run under the ground, but you can't get back to the top. The moral is to not use leap abilities near the cliffs, but this still seems like a bug. Also, I found a lonely gargoyle down there.
There's not much to see. The first picture is about where I was when I hit my leap ability. And next is under the terrain near the gargoyle.