Tony Stark swiftly used the Nano Armor on his right hand to form a cannon muzzle, raising it toward where the sparks had appeared. Steve Rogers's body tensed, both fists clenched as he prepared for battle. Bruce Banner endured his headache with a frown and turned to look toward the spot in the room where the sparks had emerged. Clint Barton flicked out his right hand, letting several small explosive arrows slide from his sleeve and into the spaces between his fingers as he watched the center of the sparks.