Find a heavy object and cave the attacker's skull in with it.
If you are fast enough, grab his wrist, point the knife away, pivot and slam your elbow into his windpipe as hard as you can -- still holding his wrist -- dig his eyeballs out with your fingers and make him eat them.
When that all fails, you're are bleeding out on the pavement, realize you should have been carrying a hand gun -- if you survive you should move. Firing 3 times into the body mass usually does the trick. A 12ga shotgun at close range is better; #4 buckshot will do the most internal damage, 00 buckshot the most knock down and immediate kill -- however buckshot will penetrate drywall -- Look Honey -- I shot the kids!
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