Obviously, the generation has to stop at some point and obviously from any key image you could continue generating if you had unlimited GPU, which I’m sorry they didn’t provide for you.
I am not sure it's obvious that you could continue generating from any key image and it wouldn't deteriorate into mush. If you take that museum scene and look at the vase-like display piece while walking around it as much as you can it already becomes fuzzy and has the beginnings of weird artifacts growing out of it.
