Real-world gutter-knife-fights are dirty, vicious, brutal and savage.
A real-world knife-fight will be over before you find out that it has started, and luck is every bit as important as skill - if not more so.
If you are planning on going rodeo against another man carrying a knife, I suggest that you find something safer to do.
Playing chicken with a locomotive comes to mind.
If, however, you are interested in upgrading your knife skills, find and watch the video Surviving Edged Weapons, take some knife-fighting seminars, read Kill or Be Killed, and if you find that it floats your boat, invest in a Filipino Martial Arts course.
"The Father wove the skein of your life a long time ago. Go and hide in a hole if you wish, but you won't live one instant longer."
--The 13th Warrior
Bona na Croin
The LawDog Files