Ok I've been trying to figure this out for a while and finally was able to. In WG, after you knock down the first wall, there is a way to get through the second wall without breaking anything down.
This only works on the Demolisher (that I know of!).
Now all you have to do is line up straight with the gap in the wall, (The ones that let people run through freely) then just drive straight through.
It might take a little practice to figure it out but the exploit is there. You can bypass the second wall and just go attacking the orb door.
Still figuring out the whole picture posting thing, bare with me.
http://img3.imageshack.us/img3/1171/wg2t.jpg
http://img3.imageshack.us/img3/120/wg1v.jpg
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