GoW 2 Left Hand Advantage

All you need to do is go into cover on a wall on witch you can look out to the left by pressing L.
while you are getting into cover you must be holding L while sliding and then keep holding L and cancel the slide by pressing back on your LS(left stick) if at any time you touch the wall you screwed it up and it you let go of L you screwed it up.
This is good for hammer bursting someone on the left or corner sniping from the left. people do not see it coming.