Amelia, who’d been on duty continuously for the last week, had a well-earned day off. But other members of the security team had swapped in for her. They jogged along roughly parallel to the royals. These people dressed specifically to blend in and not seem like armed goons, so they just seemed like extraordinarily fit and clean-cut citizens moving in a strangely intentional and coordinated fashion around two women, a mother pursuing a distraught teenager toward a row of wet-suited corpses.