After Jackson shoots Cramer, O'Mahoney gets to the door & throws his bag at Jackson. O'Mahoney then turns to open the door to get out of the office. In the next camera angle, O'Mahoney still has his back to the door & he then turns to open the door.
Donnel O'Mahoney uses the word, gink, which was first used in 1906 three decades after the setting of the show. Reference: Mirriam Webster dictionary.