You are trying to smother us with made up nonsense and you are obviously not a professional security expert.
Trump's SS team was limited - seemingly to close protection only - it is much smaller than for a sitting president and therefore far less capable than what is deployed for Biden. In this case they used the available cover of the podium until the sniper's position was known, then moved Trump once they had word that the shooter was neutralized. They had to work with local police via radio and it looks like the police killed the assassin.