Poppabear, that was a very good telling of what happened to you. I'm glad you only ended up with awful bruises and nothing broken.
I too found out that amsteel will not hold a knot but I was lucky because I'd put a stopper knot at the end of my rope. I had a bowline slip and until then, I flat just would not have believed that the bowline knot could even move. Never say never!! After that, I started learning how to splice and make whoopies with my amsteel.