I did the same thing when I was working on the exhaust on my 68 Fairlane. Had it up on bumper jacks and pulled on tail pipe without putting my foot against the frame. It was like slow motion as it came down. I was on my side or it would not have touched me as the wheels was still on it. Hurt my left shoulder but nothing else.Yep, that’s the one Doug. Ya, I had my Subaru Brat jacked up and she rolled off the jack and blocks I had under it and landed on my legs and pinned me. I was by myself at the time. Luckily after a while I was able to wiggle my way out. Luckily I was not hurt bad. Some bruising. But sure opened my eyes as to how to block a lifted vehicle.
Noel