Currently in WSG you can jump trough a wall and hide the flag behind it.
the spot is just to the left of the gate and you can jump trough it.
watch out tho there is a hole in the ground just behind it and you get stuck in there.
screenie 1 shows the spot where you can jump trough and screenie 2 is where you land
note: if you dont move far enough in time you will die instantly. Dont get stuck in the hole and you can troll some alliance players ^^
edit: added screenshots