The nation's capital, usually a hunting ground for journalists , became the story itself Saturday night. Hundreds of reporters, gathered for the annual White House Correspondents' Association dinner as President Donald Trump prepared to speak, were plunged into chaos by an attempted gunman breach. In the aftermath, personal safety and professional duty blurred. The nation's most powerful reporters and editors grappled with events unfolding before, and often above, them. Many, in tuxedos and gowns, instinctively ducked for cover, driven by fear, bewilderment, or pure instinct. "We were under the table before we knew what was happening," wrote The Atlantic's Missy Ryan, Matt Viser and Michael Scherer of their experience. Emerging from cover, their mobile phones became essential tools. They captured images, recorded interviews and maintained open lines to describe the scene to off-site colleagues.…