“The shot I saw of Trumps head and the passing bullet looked incredibly level. Like the shot wasn’t from an elevated position. Just speculation on my part.”
Consider:
that Trump was on a platform putting his head over 12 feet elevated.
The building has a low roof. Less than 20 feet at peak.
Building is sited on ground lower than Trump’s platform.
The elevated position was not on a tall building, Trump was on a stage, and there was a good distance between them. The angle didn’t need to be very great.