During a forensic autopsy of a 35-year-old woman who died following blunt trauma to the chest, the pathologist examines the injuries. Over the right anterior chest wall, there is a large area of bluish-purple discoloration with intact overlying skin and no break in continuity. Over the left anterior chest wall, there is a wound with jagged, irregular margins, tissue maceration, and oozing of blood and tissue fluid from the abraded surface. Which feature best distinguishes the injury on the left from the injury on the right?