Not a knife fight per se, but I was attacked by a homeless man with a box knife back in the '80s as a teenager. I was coming out of a liquor store in a not-so-nice area when a sickly looking man dressed in many layers approached me and mumbled something. I came closer to try and understand what he was saying when he struck out with his right hand and sliced open the down jacket I was wearing from sternum to waist. I guess the guy was just crazy and wanted to cut me because he then started to turn as if to walk away. I took him down with a double leg, which was stupid on so many levels :whip:. I could barely see with all the down flying around, for one, and I clearly put myself back in the danger zone for another. A buddy who was in the liquor store came out at this point and we proceeded to subdue the guy with some kicks. Ok, they were stomps. We should have called the cops afterward, especially since it was pretty obvious he was mentally ill, but we didn't. Most likely because we were underage and buying liquor at the time. I only suffered a small nick near my solar plexus.
Lessons learned:
The knife is a devastating and quick weapon, even by those with a reduced capacity to use it. I'm not sure how much skill plays a role over the intent to use it.
People with the intent to hurt, not threaten, with a weapon will try to conceal it until they use it, so expect anything, be aware, and whatever counter techniques you use, they better be simple, quick, and effective.
Listen to those alarm bells in your head.
Don't focus on one feature of a potential threat. I was looking at this guy's face and didn't see his arm come up until it was too late.
Without my jacket, I could have easily been gutted. If I am ever again attacked with a knife, and it's a prolonged or obvious attack, I want to put as much clothing, metal, whatever's available between me and the blade--garbage can lid, jacket wrapped around my arm, shoe, hat, anything I could use as a shield. I'm not sure how much protection my jacket would have provided against a sharp, slashing 4-inch tactical blade, but I'd rather have some protection than none.
Don't let surprise paralyze you. Make survival a priority and MOVE. If the slasher had pressed his attack, my disbelief and inaction would have made me really vulnerable.
Last but not least: Avoid knife fights if at all possible.