This is a scary story. For me, it's unfortunate that a shark dies, but it is a gripping adventure (photo at right).
As a person who gets in the ocean a lot, I can't help but think about things like this now and then. Usually when a dark shadow catches my attention, swimming off to the side or behind me. I'm glad it's never turned out to be anything truly scary. Like the time a big grey shape swam under my surfboard, much larger than the board, but it turned out to be a dolphin. A moment of concern, but no big deal.
Two free divers (no scuba) were hunting tuna with spearguns. A shark came along, a BIG tiger shark. Big tiger sharks can be dangerous. These two are experienced, not easily frightened, and they felt like this animal was threatening.
So one diver speared the shark and a 2 hour struggle ensued. The shark died, and the divers survived unharmed.
Was it really necessary to kill the shark? Nobody will ever know, and the divers have the best standing to guess. I don't carry a speargun when I dive, and I wonder what would have happend if it were me?