I believe that in Call of Cthulhu: Dark Corners of the Earth, Jack could have had saved Rebecca if he dragged Rebecca into the church. The game does not show that she was shot in the head, so Rebecca had a chance of living and could have had bandages/splints/sutures applied to her from Jack's medical supplies. Maybe you could make a fanfic with this, where Jack tries hard to keep people alive instead of watching them die.