For those who have never seen one, a baitball is where a school of small fish form a tightly packed school as a defense against predators. It is very pretty, because the fish are often silvery, and thus there is a constant flickering in the light. As the predators (a couple of small tarpon in this case) close in, the baitball adjusts itself to swarm away from the predator, or open up to flow around the predator. The poor hungry predator cannot quite catch up to the individual fish, and cannot easily separate one tasty morsel from another and thus cannot quite snatch one up.