I'd run out into the street and find a guy on a motorcycle. I would stand in front of him to make him stop, but if he didn't, I'd jump to his right at the last second and hit the kill switch on his bike's handlebars, causing him to slow down. Then I'd run up to him and give him a quick chop to the larynx. If he blocks, I grab his arm and pull him towards me, also pulling him off the bike. I'd follow that with a quick kick to the ribs and I'd also grab his helmet and snap his neck (easier to do with the helmet - more leverage). Then I grab the bike, ride to the nearest guns & ammo store, perform the same incapacitating maneuvers on the employees so i can grab a Colt AR-15 with ACOG, 6 position collapsible stock, and quad rail hand guard, and 500 rounds of ammunition. I then ride as far from the epicenter as possible, splitting lanes to get through the inevitable traffic jams.