Outside the window downrange from the alley of pain is nothing.
I don't think it is viable to escape out of my window due to living with someone else that I would want to protect as well. I don't think (for more than one reason), that I can make adjustments to my bedroom door (other than a lock)
In regards to where I would stand in the room, The door hinges are on the right, so if I stood out of the alleyway I would be the first thing they would see if they were opening my door. I would also be firing in the direction of the person in the master bedroom