Just like in the ghost shooter (beginners tutorial), set them to fire from the origin point at the angle of the sprite. If your sprite is actually turning left and right (mirror/not mirrored) then it should work. However if all you are doing is putting a sprite in that faces the other way you will need to change the angle of the arrows by 180 degrees when facing the other way.
Sorry on a tablet so can't open the capx from here...