Unbelievable.
The gunman was allowed to shoot first. These snipers are highly trained to shoot accurately in a moments notice and that man in the crowd warning was enough ample time given. Even if he missed, the noise would have made other SS cover PDJT quicker, and made the gunman lose focus. The gunman was on his belly and had to get into position after climbing the ladder, all which takes time and is easily noticed from their vantage point.