Geez. I would hate to be sitting in a tinny tucked into a hidden spot just beside some mangroves and suddenly see one of these things appear from nowhere coming at me at high speed.
My guess is that they will deliberately hug shorelines closely so as to maximise the effect and increase the thrill. I can sense a fatality waiting to happen when one of these things ploughs into a sleepy tinnie just around a bend.
I wonder if they make a lot of noise?