They return to headquarters and await the police chief's call ('10:52: Back at the old desk, waiting for a call from the Chief. Half a cop's life is spent in waiting. 10:53: the Chief called.').
The officers resumed their duties at headquarters, passively waiting for a phone call from the police chief ('10:52: Back at the old desk, waiting for a call from the Chief. Half a cop's life is spent in waiting. 10:53: the Chief called.').