This pro stunt man was showing Isellers how to "float down slowly" as not to put to much pressure on his newly healing leg. Note this was staged at a controlled environment with foam rocks under the fragile BMW cyl head and bike was not running it was gently set down.
Note no BMW's or riders were hurt in the making of this safety poster. You can see the foam under the BMW at all contact points if you are really smart. WE CARE