To me and to all the others I saw, there was only one clear cut solution to the scenario. I could easily maintain control of the arm and keep my opponent on his back. If he moved position to try to change knife hand or even roll into the mount I could get up without being cut. Stomping in the hand or any other attempt at kicking was not really an option.
Just to be clear, the solution I proposed was stomping on the opponent's knife hand while controlling his arm and keeping him on his back. How was that not an option?