One night at Hamilton in San Francisco earlier this year, right at the moment of the Hamilton-Burr duel, an audience member had a heart attack; the commotion made some people believe there was a real shooter in the house, and the audience stampeded. A real shooting during a play could happen, as it has at cinemas and rock concerts; live-shooter training for theater personnel is now a thing. And since art reflects life, we’re seeing more guns onstage as well. Lisa Lacroce Patterson writes about how theaters are dealing with guns, onstage and off. – American Theatre