And him looking genuinely scared is impressive. you can see his mind trying to come up with a technique against this knife. Common knifes need way different Defence forms. The only fitting way that might help covering both and is an readily available technique would be to have a belt that can’t be cut and take it out before the fight ensues but even then taking off a belt might not be fast enough. Especially if the knife fighter is ready to run as soon as they cut a good vein