The whole concept of the bait-and-switch is perfect for what we want to accomplish here. The mates teased the fish right in tight to the stern, and the angler cast the fly to keep its interest as I slipped underwater for a quick close encounter and to capture the fish's behavior on film. Sails are often jet-black in color when they come into this phase of the chase, perhaps to appear more robust and intimidating to their prey, by making their presence known immediately. A fish this size is surely not going to sneak up on its prey in open water. The typically folded-and-tucked-away feathery pelvic fins suddenly pop out as if from nowhere to alter its profile even more, again making the sailfish appear larger than ever to its forage. At this point, sometimes they just "pile on" the fly as though nothing could keep it from its destiny. Other times, through selective brain processes or from inquisitive apprehension, the sailfish doesn't quite "feel the love" enough to strike. One thing is for certain, they like their prey moving, not still. The instinct for a prey species is to evade capture, and that's what the sailfish is expecting to head off at the pass.