I'm feeling very foolish and embarrassed about putting my mouth (or, typing fingers) in gear before engaging my brain. I don't break down a 1911 with the slide locked back. I rack the slide to cock the hammer, engage the safety to secure the slide in place, and proceed from there.
Somehow, when picturing the operation in my mind, I confused myself with the racking and locking the slide in place with the safety. I'm sorry if I misled anyone and alarmed others.
I never have used a bushing wrench. I guess I've never handled a 1991 so tight it would require one. If I did, I think I'd release the safety so I could push the slide back enough to release the contact between barrel and bushing.
And, again, I never have launched a spring. But, as was pointed out to me, if I did with the slide locked back, I'm certain it would go into orbit.