Falkus said:
Unless one of them decides to start doing lethal damage, which would be representational of a real fist fight between amateurs. Knocking someone out without risking permanent injury or death is not something that most people can do.
Uh, no. Knocking someone out without risking permanent injury or death is not something that *anybody* can do. A knockout is either caused by a direct injury to the brain or by the loss of blood flow to the brain (shock). That's it. Knockouts with fists are overwhelmingly of the former variety.
But in RPGs we're a little more merciful and cleave to cinematic guidelines about KOs, which do not include things like permanent brain damage, sudden death long after the fact, retroctive amnesia and long term complications caused by brain lesions, cerebral hematomas and a swollen dura mater.
The fact of the matter is that people can knock each other out regardless of how experienced they are, but trained fighters can inflict even more injury. In RPGs we make room for movie-style knockouts which leave a slight headache and little else, but in cinema, those knockouts are delivered by novices just fine, too. So it doesn't work for reality *or* cinema.
Part of the problem, too, is that the threshold for significant injury is far higher for D20 characters than for regular people, but D20 characters are injured in a much more statistically regular fashion than real people. In real life, some people get shot 20 times in the torso and live; others get shot once in the foot and die. This kind of chaos is unsatisfying in a game system, so instead, we have people who are harder to incapacitate that real people and who react to injuries in a much more consistent fashion.