Add another depth check.

terrain.lua

@@ -210,6 +210,12 @@ loud_walking.terrain = function(minp, maxp, data, p2data, area, baseline, height
     return
   end
 
+  local extent_bottom = loud_walking.extent_bottom
+  local extent_top = loud_walking.extent_top
+  if maxp.y < baseline + extent_bottom or minp.y > baseline + extent_top then
+    return
+  end
+
   if not loud_walking.csize then
     loud_walking.csize = vector.add(vector.subtract(maxp, minp), 1)