"During an attack, the chaos and sheer terror cause many people’s brains to shut down, leading them to freeze like scared rabbits, even if they’re standing in a hail of gunfire. Other people end up stuck on the X simply because they can’t sort through the bedlam fast enough to figure out that they’re in mortal danger. To avoid the 'freeze effect,' you need to cultivate an 'orienting behavior.'" - Jeff Cantor, at Money and Markets
I suspect alcohol played part in amplifying "freeze effect" in the Pulse nightclub shooting. Alcohol slows assessment and reaction. And I suspect much alcohol had been consumed by club patrons prior to an attack that began just after 2:00 am.