I am aware of an incident in north county where a women stabbed a guy in a parking lot altercation. She stabbed him once, cutting an artery. His friend, a Navy corpman assigned to the Marines, could not save him even though he had his combat first aide kit in his car trunk. As CCWI stated, knives are very deadly. My .02 is, if confronted with a person with a knife, get as much distance away as you can from him/her. Live to tell the story.
YD