my legs slip out from under me and i 'm not quick enough to catch myself and i fall down and keep falling , sliding down the hill , bumping into bushes , picking up speed , feeling a tearing in my back , and i reach out to stop myself but my hands are too slow to catch anything and i judder judder judder along the leaves and grass and then i hit a bump and skip up into the air , tumbling over onto my shoulders , pain searing thru them , and i call out loud and i do n't stop falling till i come to a thicket of brambles at the bottom of the hill and ram into 'em with a thump .