I think you know that took my statement out of context as I was clearly talking about empty hand strikes, but let's use this as an opportunity.
As I said, some posters did not seem to understand or appreciate the nature of the advantage an edged weapon affords.
A brick definitely increases your chances of a one hit KO, but barring that, would you want to trade blows brick vs. knife? Who wins the battle of attrition?
The knife is a superior weapon; therefore you must overcome it with superior tactics.
I apologize for being flippant. Do you have any tactics you would like to discuss? George gave a brief description of a reasonable tactic - delivering a few aggressive strikes to a knife-wielding attacker before worrying about stripping the knife - which was part of a training product he had created for law enforcement and security personnel. You refuted it off-hand without really offering anything in response, and furthermore didn't seem to understand what he was talking about.