JWLuiza
Black Belt
Not in my experience. I've taken full force backfists from some of our more enthusiastic students and it never came close to knocking me out. Didn't even hurt too bad. Punches on the other hand hurt a lot more, and cause knockouts more readily - aim for the chin!
I would tend to agree, which is why I am suprised by this trainof thought. A backfist to the temple is the only way I'd be worried.