zacktly… I was just doing this same edit. The shot that hit Trump had to be roughly parallel to the stage both vertically and horizontally. Well aimed shots from an elevation would not hit the so high in the bleachers or on the fork lift.
The hit on the speaker crane is roughly at the kink. The hit on the person in the bleachers is roughly on the same line. Hit on Trump had to be roughly parallel to the stage. Green line matches all three.
Noted: Well aimed shots from an elevation would have hit lower after passing the stage. However, Keep in mind patsy was under stress and could have fired almost anywhere.
Note that the building above and behind the patsy's building also may have a clear shot. They may have been screwed, because they were waiting for the bumbling patsy to squeeze off a shot. Shots could also come from inside a vehicle. Note shipping container in parking lot.
Google-Earth view shows estimated line of sight from different perspective.