Playy Forge and turn into the Oracle. Place a two-way node below a fence and go directly up to the fence as far as you can. Then, gothe highest point while hugging the fence. After that, place a two-way node where you are located. It should spawn on the other side of the fence. If it disappears, try again. Go into the node still as the Oracle. Do not turn back into Spartan or Elite or else you only have five seconds before the Guardians kill you. Also, do not touch the ground or you will die. You can stand on the ledge or Warthog. If there is no Warthog behind the fence you are at, it is the wrong one.