I was interested in reading this post, I thought some of it was just wrong, But was willing to set that aside for newbie terminology problems. All that aside up into this last part. I know from experience this is impossible to accomplish. there cannot be a round in the chamber (snap cap) and be able to remove the slide. See, the end of the round (snap cap) is between the extractor and the FP area which makes it impossible to remove the slide.
Great mystery part though. Next time don’t go so far.