Dr. Lecter
Contributor
I know that in NY state those who harass hunters and chase game away can be arrested. If someone is pursuing a legal activity and others try to disrupt and prevent that activity they are in danger of being charged with harassment, and possibly even infractions of the fish and game regulations.
I do not know this particular situation well, or the HI fish and game laws at all, but if someone is engaging in a legal activity they are often entitled to certain protections under the law from people who would deliberately prevent that activity.
Having said that, if a hunter ran up to a protester and physically assaulted them in any way, they too would be breaking the law and subject to arrest. Approaching someone underwater who is not in your face and risking your life, and ripping that person's life support system out of their mouth certainly would seem to be risking an assault charge.
Harassment, however, requires that they be actively be trying to interfere with the hunting/fishing, independent of any interference caused by their legitimate First Amendment activity. The fact that you happen to be undertaking a recreational activity does not give you title to your own little patch of woods/ocean, even if the presence of another doing nothing more than taking images arguably affects the animals' behavior.
In addition to the Hawaii statute not covering saltwater activity of any kind, what I've seen in the video doesn't rise to that kind of harassment.