Re: The Definitive Tactics Thread
My thoughts –
The security guard (SG) lost control the second the bad guy (BG) fled to the second floor.
SG did not know conclusively whether or not BG had a gun and chasing him up forfeited tactical control by allowing an unknown to enter the equation.
SG should have immediately notified his chain of command and local police and waited for local police to show up with sufficient and superior firepower.
Everything that occurred after the erroneous decision to pursue was derivative of that bad decision.