NTSB says the FO from the MIA incident auto-defenestrated via a cockpit window.
Video of the other guy falling from the door (no slide?) makes the window seem like an odd choice. Long way down.
Turns out there are ropes and descenders for this purpose. Cool video:
www.youtube.com/watch?v=2y5l...
youtube.com
Cockpit Escape Reels 747-300
YouTube video by flightcrewguide.com