I counted at least 4 secret service agents that were 5’5” or shorter. One of them was on top of Trump after the shots were fired and walked him off stage for cover from the press camera stage, giving a clear shot at Trump’s head several times until he was in the SUV. I would say safely in the SUV, except 3 of the short agents all lined up to protect the windows of the SUV from possible shooters with the top half of their heads just clearing the bottom of the windows... Then it looked like all 3 of them were running around in different directions looking for the right direction. That’s when the 4th short agent appeared with automatic weapon drawn and pointed at the crowd as the SUV departed.
You are right....Trump's head was clearly visible as they were taking him off the stage.