I had to wait till I got home and worked out both defenses with the GF...
Attacker comes towards you with the knife in an upward thrust stance
As he stabs forward and up..you block with forarm hitting him at the wrist.
At the same time you deliver a punch to the chin or throat, you grasp the wrist of the knife hand.
With your punching hand, you grasp the attackers knife hand so now you have a double grip on the knife hand..wrist and hand..
You now deliver a groin kick..as he bends over foward, you dig your fingers in and strip the knife from his hand.
You deliver the groin kick, then leverage his wrist to the left in my case..and take him to the ground..kick him in the side a couple of times and strip the knife..
The problem I have is hitting the wrist with my forarm..and that couple of seconds while punching the throat that I do not have a grip on the wrist... I found with practice last night..and working on it more with the GF.. I can block and grab at the same time..thus removing the threat I feel..
So it's all good now, but I am now curious about what the rest of you were talking about..