Authentic Pekiti-Tirsia Knife System Instructional DVD

I and others have experienced to loose the knife more often than usual with that grip, no wonder due to the grip is dependent on closing the hand before contact, but with a short blade the speed is so high that the eyes cant track the blade, if I could choose how my opponents should be easy to disarm I would prefer this grip, any hard contact will make the knife fly of your hand, even if its only forearm to palm or wrist contact. There is a specific time when this grip can be used, but better focus to have the grip with less tendency to disarm yourself by accident.