I believe it’s possible that there were two shooters but don’t know if there is audio of two guns being fired simultaneously.
Did you see the video the cab driver made?
You tell me what you see and hear...
https://www.youtube.com/watch?v=o5wtLXiqwHQ&list=PLDqlVKtqjVq5q2WwI3lsZes40Tmz6cUCM
Look for you tube of taxi driver. Muzzle flashing from lower floor and sounds of two shooters. Possibly an echo, since I’m no expert, but sounds like two differing locations to me.