May 4 marks World Firefighters' Day. Through the lens, what they see in the seconds we'd never want to face. Bravery doesn't pose for the camera. The Osmo Nano caught it anyway. 🎥: Mohaohuiyouchaonengli #DJI #OsmoNano #WorldFirefightersDay #FirefighterPOV #May4 #ThankAFirefighter #HelmetCam #shorts