Still in her EVA suit, with the Alien skulking ever closer toward her, Ripley hits the airlock's emergency release, opening it and jettisoning both herself and the Alien into space.
Still in her EVA suit, Ripley is cornered into the airlock with the Alien skulking ever closer toward her. Her only choice is to hit the airlock's emergency release, and she jettisons both herself and the Alien into space.