The Book of Revelation can and has been interpreted a hundred thousand ways.
This is a strange way – but it makes sense even to my Amateur Astrology Knowledge.
Saturn in Scorpio is a Difficult aspect because Saturn is the Taskmaster and Scorpio relates to Death!
Saturn in Scorpio quote from t’internet : With Saturn in Scorpio in the birth chart, a strong will meets fierce focus. The result is persistence, endurance and sometimes ruthlessness, in the pursuit of goals.
Another quote. I looked, and behold, a Pale Horse; and he who sat on it had the name Death. : Most likely, the ominous planet Saturn is described here. The rider on it, whose name is Death, is, apparently, Scorpio. The fall of Saturn into Scorpio in the Middle Ages was considered an extremely ominous sign.