It seems to me that we do not have enough details, and if the distance really was 200 yards (meters), then that is a really expert-level kind of shooting, especially with ONLY one shot.
I don't know why people keep repeating this retarded shit.
200 yards is nothing, a child could make that shot as long as they can line up the long rifle.
I could literally make that shot at 500 meters in the offhand with a carbine let alone the prone.