So i was at hilltop ski area where i work at which is in anchorage,ak and we were seshing this 20ft jump in the park that was dope, then this kid rolls up that is always there, he decides to try his first backflip on this jump he goes up and doesn't pop off the jump and his tips catch the knuckle and we were laughing so hard. But he trys the backflip again he goes up and does his backflip to early and he hits his head on the lip of the jump which knocks him out instantly so he was knocked out in the air so i go up to him after hes done rolling down the landing and hes in shock so after everything happens i guess he fractured his back and a concussion.