Here is a passing video I did promoting the MFCA passing tool. This is something I do from time to time. The techniques I use here are what I use in game action.
My QB, I have been using the same one for 38 years. Take a look at this Youtube video and see the quick strike and some stress put on the leg.
http://www.youtube.com/watch?v=wRSCKTWPUe8