Writing Prompt 3: the Doppelganger

Someone who looks exactly like you approaches you on a city street, wearing a look of sheer terror. Thrusting a piece of paper into your hand, your doppelganger says “Find Luka. Tell him all pathways lead here. All of our worlds depend on it” and shoves you into a nearby alley. Your doppelganger runs off and from your hidden position, you watch two men run past the alley. Seconds later you hear the sound of gunshots.