That diagram is quite pretty but I suspect the speeds involved were quite low. I baled out halfway down a long hill at about 25mph when the bike went into a violent shimmy. The bike instantly stopped shimmying and carried on quite happily to the bottom of the hill, about 200 yards, until it rubbed on the grass verge and stopped upright (that last bit was just a stroke of luck - if the left pedal had been down it would have dug in and flipped).
This was before I rode with clipless pedals. When I was at school, we would practise jumping off bikes at low speeds on grass - it's easier than you might think if you're not attached to the pedals. You can try to land on your feet or go for a parachutist's roll.