We cover knife work later on in our arnis syllabus, I have done a number of special classes on knife defences but I still believe that your best defence is to not be there in that situation, and make sure that you can escape and run if you are.
Good footwork is essential in moving the body out of the direct line of the knife, and some of the bokken/jo drills will help form that good footwork habit of circling and splitting and keeping the body out of the line.
The new edged weapon that I'm playing with at the moment is a medium length spear, both used to stab and to throw at speed from a horse.
While it might be an "easy" weapon to handle on the ground, once you factor in the "other partner" and the speed, things start to get very *interesting* and often rather scary at times!
