The shadow held an arm out and, suddenly, something dark and pointed appeared at it's side. Momentarily, it hovered in the air, but then it slipped into the duplicate's hand. The pointed object greatly resembled a machete, although it was obviously a tad bit larger than the average weapon. He swung it at The Joker, making a swipe for his arm in the exact same moment in which the clown took aim at Sam.
At the Sam time, Sam moved to the right, ducking away in the event that The Joker chose to fire away at him anyway.