"My first instinct was to find cover and hide." Florida State University student and teacher Sophia Ziemer was on campus on Apr. 17 when gunshots rang out in a mass shooting that killed two people. She called the alleged gunman's plan "sick and twisted," adding that the shooting spree felt "very premeditated and planned." Find out how Ziemer and others, including a 9-year-old boy, fled to safety by barricading themselves in a meeting room for hours in this exclusive interview with The Post.