In the final scene of The Departed when Sullivan (played by Matt Damon)returns to his apartment he finds Dignam (Mark Wahlberg) waiting wearing gloves and hospital moccasins and pointing a gun at him. Dignam just walks off after shooting Sullivan. What was the significance of the gloves and moccasins? If Dignam was taking precautions for not leaving any evidence or sign on the murder site, then how did they help? Or is there some other reason?