Motives are important. That is what is very perplexing about this case. No motive can be established as of yet. Sometimes the motive is just plain evil. Why would the police hide the fact that there is a 2nd shooter, unless perhaps it is to snare him by making him think they are unaware of his presence. But that doesn’t seem likely either. Also it would be extremely difficult to keep the fact hidden that the police have cordoned off a 2nd crime scene to investigate.
Unless they were unaware of a second scene for quite a while.
So far, IF those were muzzle flashes, they didn’t last long—nowhere near as long as top shooter.