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.
Preferably a dustbin lid if available, trouble is they are like coppers......
Wheelie bins are bloody useless....!!