Ok, now any class can get through it, I myself did it as a Orc DK. Basically, go to the gate that has to be destroyed with the relic behind it, get feared through the wall and click the relic, profit. I have no SS's but it's incredibley straight forward, just rely on luck to go in the direction of the wall.
The 2 ways I have confirmed this are -
I was MC'd by a priest on the opposite faction and a warlock on my faction feared me and I landed through the wall, clicked relic and won.
Another time was just a normal running in to plant a charge, was feared and landed through the wall.
I searched for anything on this and it came up with nothing. Enjoy.