Yee-haw...London cops go Cowboy on hapless Brazilian tourist.
Well, the mysterious guy in the coat was no shadowy, swarthy, Islamic terrorist...he was just a swarthy tourist from Brazil who spoke Portuguese and did not understand what the cops were screaming at him to do.
There was no 'suicide vest' under his overcoat. He had no ties to al'Qaeda or any other terrorist organization. He was just in the wrong place at the wrong time.
Jolly good, boys. Maybe you can come work for LAPD when you get kicked off the force in London. :P