Reformed Tyrone here.
Best way to defend yourself from a knife attack is to make sure that you don't use both hands to try to defend yourself from the knife.
He's going to use one hand to hold you off, and the other to shank you with.
Try using one hand to counter his "holding off" and the other hand to grab his wrist.
When you have a hold on his wrist, try to cause as much pain as possible to his hand/wrist. (Since you have the major threat [his wrist] under control, you can use both hands to get him to drop the knife)
I'm drunk as shit off some fuck asd corner store beer rn so tell me if this makes any sense
>>1447982 has the right idea, but only if you habe freedoms. 
