I didn't notice the "spray" she saw and you saw as well on some videos. In which video can we see that "spray" that could have been caused by a bullet? Might be interesting because we could figure out some angles where the bullet could have come from that caused that spray, depending on the time frame.
It would seem then that based on where the telehandler is (bottom, right of the green tractor), the shot that caused the spray would line up with the guy on the roof (keep drawing the line in the picture downwards).And this Daily Mail article has some good pics too:
It would be interesting to know where the other causalities where if we want to work out more angles. If they are all just the guy on the roof, then I suspect they'd be in either of the stands along the line drawn above.