A knife is deadly force, PERIOD.
If you attack me with a knife, you WILL be shot.
- I will not turn my back and run away.
- I will not try to "reason" with you.
- I will not try to shoot the knife out of your hand.
If you don't want to get shot, don't unlawfully use deadly force against people. It's just as simple as that.
I'm just glad I don't live in the UK where I'd be expected to keep calm and bleed out...