Stuck Alone in Battery Park Literally everything here is a plot spoiler so; So I just betrayed UNATCO, saved brother, ran through troops, took subway to battery park ran past Navarre, then Gunther stopped me at the top of the subway stairs. Jock seems to have been visible flying overhead.
You'll need to be in NYC for this in Battery Park, have discovered Trinity Safehouse, and start the puzzle between 5:30-5:45 and wait until it is between 21:00-21:15 for the second-half of the puzzle.