Matt Wennerstrom was at a bar with his friends when a gunman started firing. First, the 20-year-old ushered people behind a pool table. Then, as the gunman reloaded, Wennerstrom threw a barstool through a window, creating a path of escape. Thanks to Wennerstrom, dozens of people escaped from the gunman who killed 12 inside the country music bar in Thousand Oaks, California, the Washington Post reports.