That is an idiotic post considering the facts as they are currently being reported.How the UK would have done it ...
When the officers first arrive they will make an immediate assessment. If an armed containment is deemed necessary to isolate an armed suspect from the public, then two of the crew will deploy leaving one to control the incident, calling for further armed support and liaising with the local senior police officer. All these officers are personally armed with 'Glock' 17 self-loading pistols and two of the officers have access to 'Heckler and Koch' MP5 carbines.
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How America dealt with it ...
"Hey buddy ... step away from the window .. or I'll shoot you in the .. *BANG! BANG! BANG!* ... head"
"Paul Blart ... at your service, Sir!"
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Scary, huh?
'Nuff said!
When a person pulls a gun on a security guard or police officer they are immediately a threat to that guard/officer and anyone else around them. In this case, it appears the suspects fired first (and a lot of times as well), so I don't think that the guard just walked up and put the gun to the guy's head and pulled the trigger.
Reading is fundamental, maybe we should get you hooked on phonics...