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Look at the portion 12:18 into the video. The front windshield of the truck in the snow exhibits crazing and puffs of smoke generally indicative of breaking glass. This generally wouldn't just happen on its own and says to me that the vehicle was fired upon.

As for when he was shot, the distance is too far away in the video to to really see what is happening. He could have stumbled, or he could have been going for a gun. Kind of hard to tell at that distance.