Here's a video of some rioters using umbrellas as cover to mask their approach and launch an attack on police. https://www.youtube.com/watch?v=U1VdhQbfSTY&feat

Here's a video of some rioters using umbrellas as cover to mask their approach and launch an attack on police. https://www.youtube.com/watch?v=U1VdhQbfSTY&feature=youtu.be https://www.youtube.com/watch?v=U1VdhQbfSTY&feature=youtu.be Seems pretty effective on the ground, but the drone footage shows what they're actually up to.