If you start the demo, leave the starting location by going left and then look at the map, then it shows the starting location as though you were never there.
Why do you set the house on fire (which you actually do)? This will remove all the clues ... Ahh well, I know. If the house is on fire the extinguisher is of use and so you don't refuse to carry this heavy thing around anymore.
Sadly I was too late. Even though I saw the woman alive her life ends the very moment when I enter her room :( Due to the slow motion I actually saw the bullet flying :/