My question would be why after the first shot when the lion dropped and then was back up as the camera ran and ran, why no follow up? It is my belief dangerous game or not if you have a follow up shot on a animal that is not down on the first shot you take it, not only for safety but out of common descent behavior and respect to a beautiful beast.

A lucky group indeed I don't see how the lion missed, If the lion doesn't get you the shear number of riles in the confined space should.