There was someone on X earlier who said that SS uses circles of engagement and that those snipers were scanning for threats well beyond the 300m mark. The sniper heard the first shots, made visual acquisition, adjusted his rifle down, and took the shot.
There’s also video out there of people screaming from the ground that they saw the shooter at distance just seconds before the first shots rang out. The fact that law enforcement didn’t react when a din rose from the crowd about a possible shooter leaves me completely confounded. That’s tantamount to yelling fire in a crowded theater, esp. in a location where president, past or present, is nearby.
“There’s also video out there of people screaming from the ground that they saw the shooter at distance just seconds before the first shots rang out.”
More like two to three minutes before he started shooting.