When you're squared up with someone, you're not just trying to hit each other, you're actively trying to avoid getting hit at the same time. Go experience LARP yourself and see firsthand, I'd recommend it! XD but anyways...
You can swing at someone a lot, quite a few will miss entirely. If you're good, you can hit them more often than not, but not as hard as you hoped, or in the exact place that you were trying to strike. Again, this is because they don't exactly want to be hit!
However, when the stars align, and you see that perfect opening and stab them right in their gut as their shield is just out of the way, THAT'S a critical hit! That's why I think most RPGs get them right; part luck, part skill, massive damage.
I also think an interesting mechanic based on that is level disparity affecting critical hit success. A knight who trained all his life, fighting a 15 year old squire boy is going to land so many more critical hits, and will be opened to so few of them.
You can swing at someone a lot, quite a few will miss entirely. If you're good, you can hit them more often than not, but not as hard as you hoped, or in the exact place that you were trying to strike. Again, this is because they don't exactly want to be hit!
However, when the stars align, and you see that perfect opening and stab them right in their gut as their shield is just out of the way, THAT'S a critical hit! That's why I think most RPGs get them right; part luck, part skill, massive damage.
I also think an interesting mechanic based on that is level disparity affecting critical hit success. A knight who trained all his life, fighting a 15 year old squire boy is going to land so many more critical hits, and will be opened to so few of them.

