A pharmacist who survived a 2021 mass shooting at a Boulder King Soopers said Thursday during the gunman's trial that she heard him say, “This is fun” at least three times during the shooting. The chilling detail had not been revealed before. Sarah Chen described how she hid with her coworkers in the store after Ahmad Alissa opened fire. She said she was listening carefully for signs of the plexiglass barrier on top of the pharmacy counter, installed because of the pandemic, being moved. She said the shooter would have to move that barrier and then climb up over the counter to reach them. She said she never heard it move but she did hear him yelling. Read more at: https://www.9news.com/article/news/local/boulder-shooting/colorado-mass-shooting-king-soopers-trial-survivor-testifies/73-55ef96e1-f659-45a1-aa5c-5a37abba8bad More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.