Hand held (well rested between my head and my knee - sitting on the floor :), with my new Toy:
Had to use a high ISO without tripod, quite a bit of noise and camera shake too, but I quite liked it all the same, couldn't resist playing around with my new toy - even in the dark!
Great image! Hard to believe you didn't use a tripod. You're right, it is full of energy...I especially like being able to see the guy on the bottom left.