Bring your arm round behind you and throw the staff into the front of your opposite shoulder at an angle. You can either stall it with your other shoulder or neck wrap it round to behind you.
This move can be done with or without the extra spin on the back, i like to vary it. Keep your hands together in a prayer position all the time you are doing this move or it doesn't count. If you can't get this move try continuous steves first, they will get you used to the motion.