Urgh, I wish I hadn't found this. I dropped a spawn point off the sky bubble, it span in the sky and stayed between the 2 boundaries. You can't get high enough to grab it, but yo can't go from the bubble because you die. Any ideas on how to reach it? (When you spawn, moving causes death instantly)
Try breaking he barrier from the middle level to the sky bubble. Theoretically you could keep going up untill you hit the death barrier, and you should be able to just float up to the spawn point and delete it. IF you cannot break out of the map with a turret or a teleporter or whatever, try to over load the map. I know it turns off the floor (grid) on the sky box, so maybe it turns off the death barrier?
Stop finding faults with the map! You could always try looking at your feet when you span there, then turning into an orb and deleting it without moving.
Sadly, I'm quite sure it keeps the death barrier. So overloading isn't the option. Are you sure you can't delete it from beneath?