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I am having a problem clipping through the wall, I am doing the same angles but just cant go through. Is there anything to suggest?

The Landmaster must be against one of the corner spots and be as close to it as possible. Then you want to run at the corner and the Landmaster while holding a bit more to the right (assuming the barrier is to the right of you). Doing this will push you through. There is also an enemy in the background you can line your Landmaster up with.