It's not even a fair fight, Rory is pretty powerful due to not only being a nephilim but also the daughter of an archangel, but my boy was able to make the entire world stop lying by saying 2 words.
Jack snaps and Rory turns to dust. Jack is more powerful than pretty much everyone in the Lucifervserse on par with beings like the Goddess and God of the Luciferverse and this is before Jack became GOD.
Now how is Rory winning, Jack in his nephilim form literally has killed nigh omnipotent angels super easily. Not to talk of the fact he’s now god. He is winning this