I gues thats the way of luckyness. Just lock on to the corner.. Go to right or left.. And then quick turn to right or left.
so if you run right first. Then turn left quick.
I cant realy explain.. I will let you see it.
Feel free to add me: riickyy (my ign from ca)
The corner thing always works.
Mine way works in 100% ;P (like 90% of walls on all maps.)