That theory sounds right, one of the things I've heard is that if you can roll during a fall that will distribute the impact better. I managed to do a pretty good roll after getting my wheels stuck (on a flowerpatch of all things!) and got up unscathed. A few weeks ago I hit a pebble on the road and fell in such a way that the full impact went straight to my left knee and my palms. Not the proudest fall, but I was pretty proud of that bruise.The most painful slam I ever took was practicing backside nose shove its (or switch fakie backside shoves if I want to get technical) standing still. Fell and went straight down on the point of my elbow, and it hurt so bad I didn't skate for a few days. Then less than a week later, with my elbow taped up, I did the exact same thing, right on the funny bone. This time though, the pain was so great I cried, my arm felt like it was on fire. It took all I had to drag myself inside and lay down and whimper, and for the next month I couldn't straighten out my left arm without excruciating pain. So my theory is it's better to fall moving forward so some of that energy is dispersed laterally, rather than it all impact at one point. Also, there's no shame in practicing how to slam. We used to run into the grass and jump up and fall or slide to learn how to bail without getting seriously hurt.