The Smithy: Henry of Ghent on Aquinas and Existence

Henry of Ghent: "The first way of understanding the participation of a creature in being is mistaken; it is not an understanding but a phantastical imagination. For the essence of a creature should not be imagined like the air indifferent to obscurity and luminosity, but like a certain ray in itself apt to subsist, produced by the sun, not by the necessity of nature but by free will."

Isn't it rather petty to complain that an analogy is a phantastical imagination rather than an understanding?

Thomas' image of the air's illumination is an image of one sort of thing being poured into another sort of thing to make it actual in a certain way, but for Henry (and, I might add, the Franciscan tradition in general along with him) existence can't be understood as a different sort of thing than the existing nature and added to it in order that it can be.

But does Aquinas think that existence and nature are two separate things? How can they be distinct without being separate in reality? How is "real" to be understood? After all, St. Thomas's and the Thomistic understanding of the real distinction is what is at issue...