An objection says that if both divine and human power relate to a single action, this introduces partnership in creation. The answer is that such partnership would require both to be independent creators in precisely the same respect.
An artisan and an instrument can illustrate how one action admits different descriptions, although such an analogy is not a complete model of divine attributes. Its limited purpose is to explain difference of relation.
Creation belongs to divine power; acquisition describes the servant's voluntary participation. The account does not posit two gods or two self-sufficient creative agents.