I saw this event from youtube. i think the person that made this film in usa didn't see carefuly. you can see this in slow motion there are a lot of signs through on sky. below here is the address of youtube. ( i don't know the real state of america. https://www.Youtube.Com/watch?V=rceknc8px1c i would like to know something about, please send me a message explain me it. thanks so much