Seriously I jumped a little when I saw this one. Always been my primary fear with diving. Getting shadowed, and once you're at the boat and about to get out, taking your fins off, etc, a tiger or a lemon comes up and just nails you with a thigh or torso bite.
I'm wondering if that guy shit his pants once he realized what was happening, I probably would have. If I had been the guy with the camera there'd be less footage - probably would have dropped the cam and yanked him back in the boat by whatever I got a hold of first.