my rating scale is based on contact/pressure of impact on the rider. It's a demented scale me and my HS buds made to rate our mtn bike crashes (we treated our mtbs like BMXs, so crashes were often pretty fugly).

Our favorite jump was in the middle of the woods...and we all know how those end...

My worst was faceplanting on a rock, a few seconds later, on my forearms (my fingers hurt like hell) and knees asking where the eff my bike was, then it finally landed, handlebar end right between my shoulderblades....knocking me right back into that rock, face first

Apparently the bike got tangled in some branches during the initial flight...

That was the creation of the SJJD (Steve, Josh, Josh, Duane, our first names) scale for crashes. That one got a 10 since I managed to render all my fingers unusable for a week, my face was pretty scraped up, and i had to wear a back brace for a while.

Based on that scale, that guy had a pretty good chance of being in some nice hurt....back drop on an upside down bike can do all kinds of pretty things....add in lower back/tenders being punctured by chainrings and you have a rather nice amount of potential pain...therefore the high score