[quote=@MelonHead]

In other words, there's no particular reason why a low tier fight has to end after one or two blows. Maybe you're fighting unarmed, in which case the human body can take a lot of punishment, maybe you're fighting with weapons, in which case you should really have some armour.

[/quote]

I'd imagine a straight shot to the jaw would take even a trained fighter down if another trained fighter of equal skill delivered it (note how I didn't mention how said opponent would handle the punch, as I'm not actively trying to reason out how one character can evade or alleviate the damage of a punch, which is a whole different matter), in a reasonable roleplay. I'm not talking about pure skill and how it can change the tide of battle. Skill is an assumed constant. That's just one scenario one that I proposed initially. The addition of armor changes the circumstances. Regardless, a blade through a joint can end a fight as quickly as a blow to the jaw. Superhuman characters tend to be able to tank what normally would be lethal otherwise, via enhanced durability or other means.