Defence for the defence!

At a seminar Mike Jen showed a defence for the leg on shoulder pass. When the opponent almost completes the pass you push his tricep on the arm that controles your collar. This makes him loose the pass, and you have a good opertunety to take his back. I showed this defence to a couple of guys at my academy, and now they are using it against me. I have always loved the leg on shoulder pass, but now..........
How do i defend against this defence??

Thanks for your help.