Brian's research (link below) addresses the claims that a) Mavericks took off knowing about the shooting (false) and b) Mavericks performed a "flanking" maneuver (related to the alleged shooting from helicopters), as opposed to just taking a detour around a dangerous situation.
Sources:
"Strip Tour Helicopter ATC Communications during the Las Vegas Shooting" (Brian Shields)
Helicopter Sound Effect (Best sound quality) Audio Sounds
"Helicopter Sound Effect - Flying 5 minutes" Olavo Junior