Wow that sounds like a very scary experience! Here in the Philippines, I've heard stories of tiger shark encounters with Fishermen in the Ticao pass (near Donsol where the Whalesharks are). Apparently, the nutrient-rich waters of Ticao not only attract the popular whale sharks and mantas but all kinds of pelagic fish - including tiger and bull sharks. When I was in Ticao last year, our "bangkero" or boatman told us stories of "mga tigre" (tiger sharks) bumping their boats at night when they were fishing and sometimes eating parts of their outrigger bangka. I guess these guys take a bite out of anything! Testing if they can be eaten perhaps
I also heard from Nathan Floro of Adventure Bound that they've seen a lot of sharks in Ticao during their dives around San Miguel Island - Parola point. One time they even spotted the very agressive Oceanic Whitetip. Hey, Ticao might be our mini-"Fiji" here in the Philippines