if using heavy tippet (or light tippet for that matter) and a shark or 'cuda chases your bonefish, lighten up your drag so the fish can really run. Just light enough so it will not backlash. They will usually lose the predator. Then you can bring them in quickly for the release.
I suppose breaking them off would be ok too, as they will not get as tired out from actually landing them, giving them better odds to outrun the predator when they are off your line.
However with the heavy line you should be able to land them quickly, especially the average Bahamian bone of 2-3 lbs.
I have not seen a shark in Los Roques in two visits there, and have never had a problem with the 'cudas either, though there are some there.
Cattaraugus Creek Outfitters
God does not deduct from man's alloted time the hours spent fishing.