Considering the sentence
Nearly anything can be a weapon in a martial artist’s hands., the indefinite article
a indiciates that this can be any martial artist out of all in the world.
The wise warrior stops a ranged attack before it nears him. Here, the definite article
the is used, but still, I am quite certain that the sentence talks about any "wise warrior", or that one would even qualify as a "wise warrior" by performing the named action (among others, probably).
Is this a correct usage of
the, indicating one out of a group of many?
What is this usage called properly?
Through judicious placement of wounds, the marksman ensures that his enemy cannot escape him.
I am wondering whether this could be the same kind of use for the definite article as in the second example, or whether to a native speaker this sentence indicates a specific individiual (that is a "marksman") that would be clear from context.