Find something longer than their knife so they are out of reach and start beating the shit out of them with it? Knives aren't very threatening unless they are e

Find something longer than their knife so they are out of reach and start beating the shit out of them with it? Knives aren't very threatening unless they are extremely close, and most knives can't be thrown because they don't have the right balance. Dealing with knives is trivial compared to a gun. Machetes on the other hand, that might suck