Also, I'll add, the Bahamian Governtment and the Fisheries Department aren't too fussy about what you use, just kill 'em....
I watched the video in the first link you posted and I have to say, the Bahamians also seem unconcerned about the buoyancy control and skill of the hunters either. Here in Coz, as I'm sure you know, many (most?) of the lionfish that are hunted are on a reef structure much more fragile than the sandy bottom that the folks in the video link ran roughshod over. I can only hope that hunters (and their helpers/buddies) here are more careful than those in that video. I have to say that the ones I have personally seen are not, but admittedly I have limited experience watching the killing.
kari