You asked, "If the cops think you're a bomb toting toady from falafal land, how do you not get shot?"
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OPINION:
Hi Ajnin.
I'll take a stab at your question and this applies to people of all ethnic backgrounds, cultures, races, sexes, etc.
1. Don't run from police.
2. Stand still.
3. Do what they tell you to do.
That's a start.
Their policy is to make headshots so as to deter collateral damage from the bomb carried by the terrorist. It doesn't make any sense to me that they would try to subdue a guy they believed to be a suicide bomber when their stated policy is to immediately incapacitate the subject with a headshot. I just get the feeling the guy never saw it coming and the Brit government is lying about what happen.