Thanks, as for your idea that failing to surrender a fish when challenged is synonymous with provoking an attack, most spearfisherman will make a concerted effort to avoid allowing the shark to have a speared fish, primarily because it
reinforces a very dangerous and unwelcome behavior.
Alligators can and do learn. Training them to associate humans with food is bad for the animal and also people.
Same goes for sharks.
Of course, sometimes the tax man gets his quota, but spearfisherman try to avoid it if practical.