A fairly simple one this time (maybe...) You wake up in the middle of the night and find a stranger standing in your loungeroom (or apartment, or whatever). You notice all the doors and windows are locked. The stranger (a male) does not try to attack you. He just stands there. You ask him who he is, where he came from, what he wants. He doesn't answer. You ask him to leave, and he doesn't move. What do you do? What if he is covered in blood? Does that make a difference? What if he finally speaks, but all he will tell you is that someone is trying to kill him. What do you do? Finally, what if it was a woman, or a woman with a child, and they did the same thing - would that make a difference?