Note the slow-moving motorcycle and the presumably even slower-moving protestor; not much of a challenge there. I do give the cop credit for one thing, however. When we first see the idiot screaming on the ground (about 6-7 seconds in), it's the front wheel that rests atop him. The crowd yells at the cop to move and he does--just enough to get the guy's foot with his back wheel.
Sniff. I'm a sucker for a happy ending.