This is getting very weird. Sound companys are analyzing several recordings. Several factors come into play.
Bullets travel faster than sound. They make a cracking sound when they pass near a mictophone, due to breaking the sound barrier. Shortly after, the boom from the rifle can be heard.
The time between the two sounds can be calculated into distance. Also, echos off of buildings will give another distance.
One bullet can give off several sounds that help estimate distance and location.
Short version. It appears their where 3 shooters, including the sniper. From 3 different locations. One of the shooters may have been near the ground, possibly inside a building about 70-100 feet from the shooter on the roof.
The info appears to be good. But everyone doing the testing want more tests done on more recordings.