How do you beat outskirts on sniper assassin 4

You have to shoot the 5 guards so that none of the others sees it.

As the lower guard walks right, wait for the guard on the balcony to enter, then exit and head back to the right. As he does, shoot the guard on his left, then him. When the lower guard turns back to the left, shoot him as he goes behind the wall from the last guard. Shoot the last guard.