[Shawn Dodson]

Possible mindset of the officers: Who's gonna start trouble with four cops?

I've spent my time sitting in coffee shops doing reports. I've been just as vulnerable.

Ambush tactics surprise you and put you at a time-competitive disadvantage.

The bad guy exploited the officer's inattention (condition white). There were probably threat cues, one or two of which seem noticed by the baristas when the attacker entered the shop.