The man took off his white t-shirt, then removed what looked like a gold chain from around his neck. Balancing on one leg, then the other, he pulled off his white sneakers and lined them up on the wooden boardwalk. Lastly, he laid aside his cell phone, on which he had just been talking, vaulted over the railing, and jumped. We heard the thud of his body hitting the water and the shouts that followed. No one looked prepared to jump in, but everyone had their phones out, ready to call 911. If the police had cared to ask, I would’ve said he was in his thirties, black, thin and wiry, and here the semi-certainties would have ended.