The astonishing video depicts a powerful gust of wind toppling over the barn's roof, leading to one of the startled cows fleeing outside. https://filedn.eu/lhVNGNsizwl5t7THnzzJ2c8/New%20public/AsiaWire-RoofOverTurn-01.mp4 Surveillance camera footage recorded on a farm in the city of Bijie, in China's southwestern province of Guizhou, showed the roof of the barn collapsing under…