bd, you said this:
Dragging other people (including unarmed officers) away from the suspect robustly is a pretty standard tactic until they are sure the threat has been stopped.
which would be fair enough, except that that wasn't what happened. i said this, you disagreed.
the bbc says:
A covert policeman told a court that he had two guns pointed at him by fellow officers after Jean Charles de Menezes was shot dead on a Tube train.
...
His superior officer, codenamed James, was worried that Ivor could have been shot as his attire was so similar to Mr de Menezes.
....
I shouted he's here and indicated to Mr de Menezes with my right hand," he told the court.
"I then heard shouting including the word 'police'."
...
"I grabbed Mr de Menezes by wrapping both my arms around his torso, pinning his arms against his sides," he said.
"The right side of my head was against his torso, pushing him back into his seat. He appeared to stiffen up and he was not in a natural sitting position.
"I felt his head turn towards me and I was aware of a CO19 [firearms] officer kneeling on the seat to my left.
"I heard a gunshot very close to my left ear. I was hit by the shockwave of a firearm being discharged."
Ivor told the court how he was then dragged away by one of the armed officers.
Within seconds he had a long-barrelled gun "levelled against my chest" and a pistol against his head, he said.
http://news.bbc.co.uk/1/hi/uk/7034430.stm
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it is clear that they weren't getting him to a positon of safety, they were treating one of their own men as a suspect because they didn't know who they were following.