when you die you are able to use /back to go to your death point.
So say your raiding someones base, they kill you. They think your gone they go back to their chores etc etc..... you grab diamond sword/ diamond armor. Use /back to go to where they killed you (inside their base) and then kill them while their not looking.
Even if the faction getting raided kill the player, the player will keep using the /back over and over and over until the faction has no power. Thus claiming the land.