Let us look at this synopsis in a nested frame:

The powers of humans that are “material” or “of nature” belong to the realm of possibility.

The powers of humans that are “not material” or “of spirit” belong to the realm of mediation, because they take what is material and turn it into a (distinctly different) actuality or “form”.

The “human exercising her faculties, powers and capacities” belongs to the realm of situation.

So the Medieval model of the human could be written as:

“Powers ‘of spirit’(exercise of powers(powers ‘of nature’))”

Remember, the Medieval could never have written their own model in this fashion, because the Peircean categories of thirdness, secondess and firstness had not been formulated.  By the time that Peirce formulated the categories, the medieval world was long gone.

Today, the Medieval world exists in the same way that the Roman world continued to exist during for Anselm; as fantasy, legend and ideal.