They're screenshots from drone footage but you have to watch the it in conjunction with cell phone footage from the ground and replay them a few times. Then you'd know who's who. This is about the provocation claim that Kyle aimed the gun at Ziminsky which provoked Rosenbaum. If you provoke an attack, you cannot claim self defense by WI statutes.
The two images are merely to demonstrate how much blurrier the video that the defense received is compared to the one the prosecution held back. Like I said, you'd have to watch 2-3 different videos to know who's who and pick out Kyle to see if he aimed his rifle at Ziminsky.