How The Brown Shirt Man May Well Have
 Targeted Charlie Kirk For The Fatal Shot

The Brown Shirt Man likely used his watch and dark sunglasses to sight in on Charlie for the deadly shot.  As we have mentioned multiple times, the lenses in glasses can project any visual media with in front of the eye of the wearer.  Here is a better look to give you an idea of why he was probably holding his left arm forward and adjusting it.