Unusual "Abduction" at the G20

Is this kind of arrest/kidnapping normal protocol at events like the G20 Summit? You know when they pull up in an unmarked car, surround you, shove you in, and drive away, it can't be good.

Its crazy how many people are protesting and the cops are just bullying the protesters around, here is a another example of another cop taking his actions into his own hands.

An investigation into a man's death during protests against the G20 meeting of leaders in London will assess video footage that appears to show police shoving him to the ground. more here.

UPDATE:Yes its old news but i still hate it when stupid cops get power and abuse it. I don't care if a protester is talking shit about the cop, that's what protesting is for. You arrest the person not BEAT them.