This video is in french but pretty much the vid says it all. Swimmers and snorkelers in the bahamas in clear blue water and the guy shooting catches a shark (they claim 8 ft but looking at it I'd say 6ft). Can't tell if it's a tiger or a bull but Julien Rocher says it's a tiger.
I doubt very much the shark was going for a bite... probably a bump since there were so many targets around. Still very interesting.