[Blue Jays]

"...Diving on hand grenades, pilots guiding crippled aircraft away from innocents..."

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Because those are trained warriors in combat.

Orlando victims were just people going out to socialize, drink, and try to hook-up with people.
They were not planning on a battle that night, against unknown assailants, with unknown capabilities.
Most were likely looking to run AWAY and find a fire exit, service door, or other path away from the danger.

[wrench]

There were at least 2 military vets there, one a combat experienced marine.

Todd Beamer had no military training, yet he was able to mount an attack on the armed hijackers.